There are VBA solutions out there but try this formula solution
(for whole numbers up to 999,999,999):
Cell references are in bold – copy and paste into each cell the following                                                           
A2            Number
C1            =D1+1           D1           =E1+1             E1            =F1+1              F1       =G1+1                                                     
G1           =H1+1           H1           =I1+1               I1             =J1+1              J1       =K1+1                                                      
K1            0                                                                              
                                                                                                
Q6           0                   R6            Zero                S6            Ten                                          
Q7           1                   R7            One                 S7            Eleven            T7            Ten                          
Q8           2                   R8            Two                 S8            Twelve           T8            Twenty                    
Q9           3                   R9            Three              S9            Thirteen         T9            Thirty                       
Q10         4                   R10          Four                S10          Fourteen        T10          Forty                        
Q11         5                   R11          Five                 S11          Fifteen           T11          Fifty                         
Q12         6                   R12          Six                   S12          Sixteen           T12          Sixty                        
Q13         7                   R13          Seven              S13          Seventeen     T13          Seventy
Q14         8                   R14          Eight                S14          Eighteen        T14          Eighty                      
Q15         9                   R15          Nine                S15          Nineteen       T15          Ninety
Q16         10                                                                                                  T16          Hundred
 
C2            Hundred thousand thousand  
C3            =IF(ISERROR(1*MID($A3,$L3-C1,1)),"",1*MID($A3,$L3-C1,1)) 
D2           Ten thousand thousand
D3           =IF(ISERROR(1*MID($A3,$L3-D1,1)),"",1*MID($A3,$L3-D1,1)) 
E2            Thousand thousand
E3            =IF(ISERROR(1*MID($A3,$L3-E1,1)),"",1*MID($A3,$L3-E1,1)) 
F2            Hundred thousands
F3            =IF(ISERROR(1*MID($A3,$L3-F1,1)),"",1*MID($A3,$L3-F1,1)) 
G2           Ten thousands
G3           =IF(ISERROR(1*MID($A3,$L3-G1,1)),"",1*MID($A3,$L3-G1,1)) 
H2           Thousands
H3           =IF(ISERROR(1*MID($A3,$L3-H1,1)),"",1*MID($A3,$L3-H1,1)) 
I2             Hundreds
I3             =IF(ISERROR(1*MID($A3,$L3-I1,1)),"",1*MID($A3,$L3-I1,1)) 
J2             Tens
J3             =IF(ISERROR(1*MID($A3,$L3-J1,1)),"",1*MID($A3,$L3-J1,1)) 
K2            Units
K3            =IF(ISERROR(1*MID($A3,$L3-K1,1)),"",1*MID($A3,$L3-K1,1)) 
L2            No. of digits
L3            {=COUNT(1*MID(A3,ROW(INDIRECT("1:"&LEN(A3))),1))} [Entered
N2           Hundred Million
N3           =IF(ISERROR(IF(C3=0,"",VLOOKUP(C3,Q6:R16,2)&"hundred "&IF(AND(D3=0,E3=0),"million         ","and "))),"",IF(C3=0,"",VLOOKUP(C3,Q6:R16,2)&"hundred "&IF(AND(D3=0,E3=0),"million ","and "))) 
O2           Million
O3           =IF(ISERROR(IF(D3=0,"",IF(AND(D3=1,E3<>0),VLOOKUP(E3,Q6:S16,3)&"million ",VLOOKUP(D3,Q6:T16,4)&IF(E3=0,"million ","")))),"",IF(D3=0,"",IF(AND(D3=1,E3<>0),VLOOKUP(E3,Q6:S16,3)&"million ",VLOOKUP(D3,Q6:T16,4)&IF(E3=0,"million ","")))) 
P2            Million
P3            =IF(ISERROR(IF(OR(E3=0,AND(D3=1,E3>=1,E3<=9)),"",VLOOKUP(E3,Q6:R16,2)&"million ")),"",IF(OR(E3=0,AND(D3=1,E3>=1,E3<=9)),"",VLOOKUP(E3,Q6:R16,2)&"million ")) 
Q2           Hundred Thousands
Q3           =IF(ISERROR(IF(F3=0,"",VLOOKUP(F3,Q6:R16,2)&IF(SUM(G3:H3)=0,"hundred thousand ","hundred and "))),"",IF(F3=0,"",VLOOKUP(F3,Q6:R16,2)&IF(SUM(G3:H3)=0,"hundred thousand ","hundred and "))) 
R2            thousand
R3            =IF(ISERROR(IF(G28=0,"",IF(AND(G28=1,H28<>0),VLOOKUP(H28,Q31:S41,3)&
IF(OR(MOD(A28,10000)=0,AND(G28=1,OR(H28>=1,H28<=9))),"thousand ",""),VLOOKUP(G28,Q31:T41,4)&
IF(H28=0,"thousand ","")))),"",IF(G28=0,"",IF(AND(G28=1,H28<>0),VLOOKUP(H28,Q31:S41,3)&
IF(OR(MOD(A28,10000)=0,AND(G28=1,OR(H28>=1,H28<=9))),"thousand ",""),VLOOKUP(G28,Q31:T41,4)&
IF(H28=0,"thousand ",""))))
S2            thousand
S3            =IF(ISERROR(IF(OR(H3=0,AND(G3=1,OR(H3>=1,H3<=9))),"",VLOOKUP(H3,Q6:R16,2)&"thousand ")),"",IF(OR(H3=0,AND(G3=1,OR(H3>=1,H3<=9))),"",VLOOKUP(H3,Q6:R16,2)&"thousand ")) 
T2            hundred
T3            =IF(ISERROR(IF(I3=0,"",VLOOKUP(I3,Q6:R16,2)&"hundred ")),"",IF(I3=0,"",VLOOKUP(I3,Q6:R16,2)&"hundred ")) 
U2           Tens
U3           =IF(OR(A3<10,J3=0),"",IF(MOD(A3,100)=0,"",IF(OR(A3<20,AND(1*RIGHT(A3,2)>=11,1*RIGHT(A3,2)<=19)),
IF(L3>2,"and ","")&VLOOKUP(K3,Q6:S16,3),IF(L3>2,"and ","")&VLOOKUP(J3,Q6:T16,4)))) 
V2            Units
V3            =IF(A3=0,R6,IF(OR(K3=0,AND(1*RIGHT(A3,2)>=11,1*RIGHT(A3,2)<=19)),"",IF(A3<=10,IF(AND(J3=0,L3>2),
"and ","")&VLOOKUP(K3,Q6:R16,2),IF(AND(A3<=99,MOD(A3,10)=0),VLOOKUP(K3,Q6:T16,4),IF(A3>20,
IF(AND(J3=0,L3>2),"and ","")&VLOOKUP(K3,Q6:R16,2),""))))) 
X2            Result
X3            =N3&O3&P3&Q3&R3&S3&T3&U3&V3 
Hide columns C to V
Enter number in A3 and will appear in words in X3
 
Hope this gives you what you want