We look at the division of 21699712 by 121 
The aim is to understand the frequency of 121 in 21699712.

Moving on to step 1:
The number 121 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 121

Step 2:
When dividing 21 by 121, we get 0 with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Append the next digit (6) from the dividend to 21 and continue with: 216 / 121

Let's proceed to step 3:
216 divided by 121 is 1 with a remainder of 95.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 121 away from 216, we end up with 95.
Take the next digit (9) from the dividend and append it to 95, then repeat: 959 / 121

Step 4:
The number 121 fits into 959 7 times, leaving a remainder of 112.
Write down 7 as next digit of the result. 
Result so far: 17.0
Deduct 847 from 959 and we're left with 112.
Fetch the next digit (9) from the dividend, attach it to 112 and continue: 1129 / 121

On to step 5:
1129 divided by 121 is 9 with a remainder of 40.
Record the quotient 9 as the next digit in the result. 
Result so far: 179.0
The remainder is 40 after subtracting 1089 from 1129.
Grab the next digit (7) from the dividend, add it to 40, then carry on: 407 / 121

Let's proceed to step 6:
When dividing 407 by 121, we get 3 with a remainder of 44.
The number 3 becomes the next digit in our result. 
Result so far: 1793.0
If we subtract 363 from 407, we get 44.
Take the next digit (1) from the dividend and append it to 44, then repeat: 441 / 121

Let's proceed to step 7:
When dividing 441 by 121, we get 3 with a remainder of 78.
Write down 3 as next digit of the result. 
Result so far: 17933.0
If we subtract 363 from 441, we get 78.
Include the next digit (2) from the dividend after 78, then repeat: 782 / 121

Going ahead to step 8:
782 divided by 121 is 6 with a remainder of 56.
Use 6 as the next digit of our solution. 
Result so far: 179336.0
If we subtract 726 from 782, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 9:
The number 121 fits into 560 4 times, leaving a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 179336.4
Subtracting 484 from 560 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 10:
760 divided by 121 is 6 with a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 179336.46
Deduct 726 from 760 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 11:
The number 121 fits into 340 2 times, leaving a remainder of 98.
The number 2 becomes the next digit in our result. 
Result so far: 179336.462
If we take 242 away from 340, we end up with 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Step 12:
980 divided by 121 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 179336.4628
The remainder is 12 after subtracting 968 from 980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 13:
If we divide 120 by 121, we get 0 and a remainder of 120.
The number 0 becomes the next digit in our result. 
Result so far: 179336.4628
If we subtract 0 from 120, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 14:
If we divide 1200 by 121, we get 9 and a remainder of 111.
The number 9 becomes the next digit in our result. 
Result so far: 179336.462809
The remainder is 111 after subtracting 1089 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Let's proceed to step 15:
If we divide 1110 by 121, we get 9 and a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 179336.4628099
If we subtract 1089 from 1110, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

The final outcome is 179336.4628099, with a leftover of 2.1e-07.