We look at the division of 16624905 by 121 
The aim is to understand the frequency of 121 in 16624905.

Step 1:
1 divided by 121 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 121

Advancing to step 2:
16 divided by 121 is 0 with a remainder of 16.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 16 after subtracting 0 from 16.
Grab the next digit (6) from the dividend, add it to 16, then carry on: 166 / 121

Going ahead to step 3:
121 can be fit into 166 1 times, resulting in a remainder of 45.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 121 away from 166, we end up with 45.
Take the next digit (2) from the dividend and append it to 45, then repeat: 452 / 121

Let's proceed to step 4:
452 divided by 121 is 3 with a remainder of 89.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 363 from 452, we get 89.
Append the next digit (4) from the dividend to 89 and continue with: 894 / 121

Step 5:
The number 121 fits into 894 7 times, leaving a remainder of 47.
Put 7 as the next digit of the answer. 
Result so far: 137.0
The remainder is 47 after subtracting 847 from 894.
Grab the next digit (9) from the dividend, add it to 47, then carry on: 479 / 121

Advancing to step 6:
479 divided by 121 is 3 with a remainder of 116.
The number 3 becomes the next digit in our result. 
Result so far: 1373.0
Subtracting 363 from 479 leaves us with 116.
Append the next digit (0) from the dividend to 116 and continue with: 1160 / 121

Going ahead to step 7:
If we divide 1160 by 121, we get 9 and a remainder of 71.
Record the quotient 9 as the next digit in the result. 
Result so far: 13739.0
Subtracting 1089 from 1160 leaves us with 71.
Append the next digit (5) from the dividend to 71 and continue with: 715 / 121

Moving on to step 8:
The number 121 fits into 715 5 times, leaving a remainder of 110.
Record the quotient 5 as the next digit in the result. 
Result so far: 137395.0
Deduct 605 from 715 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 9:
The number 121 fits into 1100 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 137395.9
The remainder is 11 after subtracting 1089 from 1100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 10:
If we divide 110 by 121, we get 0 and a remainder of 110.
The next digit of our result is 0. 
Result so far: 137395.9
The remainder is 110 after subtracting 0 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Going ahead to step 11:
121 can be fit into 1100 9 times, resulting in a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 137395.909
If we take 1089 away from 1100, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 12:
121 goes into 110 0 times with a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 137395.909
Subtracting 0 from 110 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 13:
121 can be fit into 1100 9 times, resulting in a remainder of 11.
The next digit of our result is 9. 
Result so far: 137395.90909
Subtracting 1089 from 1100 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 14:
121 goes into 110 0 times with a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 137395.90909
Deduct 0 from 110 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Step 15:
121 goes into 1100 9 times with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 137395.9090909
Subtract 1089 from 1100 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 16:
When dividing 110 by 121, we get 0 with a remainder of 110.
Use 0 as the next digit of our solution. 
Result so far: 137395.9090909
The remainder is 110 after subtracting 0 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

After the division, we end up with 137395.9090909 and a remainder of 1.1e-07.