We look at the division of 83962211 by 121 
The aim is to understand the frequency of 121 in 83962211.

Step 1:
If we divide 8 by 121, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 121

Step 2:
121 can be fit into 83 0 times, resulting in a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 83 after subtracting 0 from 83.
Include the next digit (9) from the dividend after 83, then repeat: 839 / 121

Going ahead to step 3:
The number 121 fits into 839 6 times, leaving a remainder of 113.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 726 from 839 and we're left with 113.
Grab the next digit (6) from the dividend, add it to 113, then carry on: 1136 / 121

Going ahead to step 4:
121 can be fit into 1136 9 times, resulting in a remainder of 47.
Put 9 as the next digit of the answer. 
Result so far: 69.0
If we subtract 1089 from 1136, we get 47.
Fetch the next digit (2) from the dividend, attach it to 47 and continue: 472 / 121

Step 5:
The number 121 fits into 472 3 times, leaving a remainder of 109.
Record the quotient 3 as the next digit in the result. 
Result so far: 693.0
Deduct 363 from 472 and we're left with 109.
Fetch the next digit (2) from the dividend, attach it to 109 and continue: 1092 / 121

Advancing to step 6:
When dividing 1092 by 121, we get 9 with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 6939.0
Subtract 1089 from 1092 to get 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 121

On to step 7:
When dividing 31 by 121, we get 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 69390.0
If we take 0 away from 31, we end up with 31.
Include the next digit (1) from the dividend after 31, then repeat: 311 / 121

Moving on to step 8:
311 divided by 121 is 2 with a remainder of 69.
Write down 2 as next digit of the result. 
Result so far: 693902.0
Subtracting 242 from 311 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 9:
121 goes into 690 5 times with a remainder of 85.
Record the quotient 5 as the next digit in the result. 
Result so far: 693902.5
Subtract 605 from 690 to get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Advancing to step 10:
When dividing 850 by 121, we get 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 693902.57
If we subtract 847 from 850, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 11:
121 goes into 30 0 times with a remainder of 30.
The next digit of our result is 0. 
Result so far: 693902.57
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 12:
If we divide 300 by 121, we get 2 and a remainder of 58.
The next digit of our result is 2. 
Result so far: 693902.5702
If we subtract 242 from 300, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 13:
If we divide 580 by 121, we get 4 and a remainder of 96.
The next digit of our result is 4. 
Result so far: 693902.57024
Subtract 484 from 580 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 14:
121 goes into 960 7 times with a remainder of 113.
Write down 7 as next digit of the result. 
Result so far: 693902.570247
If we subtract 847 from 960, we get 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Advancing to step 15:
121 can be fit into 1130 9 times, resulting in a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 693902.5702479
If we subtract 1089 from 1130, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 16:
410 divided by 121 is 3 with a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 693902.57024793
Subtracting 363 from 410 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

The final outcome is 693902.57024793, with a leftover of 4.7e-08.