We look at the division of 29838614 by 21 
The aim is to understand the frequency of 21 in 29838614.

Step 1:
21 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 21

Let's proceed to step 2:
29 divided by 21 is 1 with a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 8 after subtracting 21 from 29.
Grab the next digit (8) from the dividend, add it to 8, then carry on: 88 / 21

On to step 3:
When dividing 88 by 21, we get 4 with a remainder of 4.
Put 4 as the next digit of the answer. 
Result so far: 14.0
Subtracting 84 from 88 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 21

Moving on to step 4:
The number 21 fits into 43 2 times, leaving a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 142.0
Subtract 42 from 43 to get 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 21

On to step 5:
18 divided by 21 is 0 with a remainder of 18.
Write down 0 as next digit of the result. 
Result so far: 1420.0
If we take 0 away from 18, we end up with 18.
Fetch the next digit (6) from the dividend, attach it to 18 and continue: 186 / 21

Step 6:
When dividing 186 by 21, we get 8 with a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 14208.0
Deduct 168 from 186 and we're left with 18.
Bring next digit (1) of the dividend behind the 18 and repeat the process: 181 / 21

Moving on to step 7:
21 goes into 181 8 times with a remainder of 13.
The next digit of our result is 8. 
Result so far: 142088.0
Subtracting 168 from 181 leaves us with 13.
Append the next digit (4) from the dividend to 13 and continue with: 134 / 21

Going ahead to step 8:
134 divided by 21 is 6 with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 1420886.0
Deduct 126 from 134 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 9:
21 goes into 80 3 times with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 1420886.3
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 10:
When dividing 170 by 21, we get 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 1420886.38
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 11:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 1420886.38
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 12:
200 divided by 21 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 1420886.3809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 13:
When dividing 110 by 21, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 1420886.38095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 14:
If we divide 50 by 21, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 1420886.380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 15:
When dividing 80 by 21, we get 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 1420886.3809523
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 16:
When dividing 170 by 21, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 1420886.38095238
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 1420886.38095238 and a remainder of 2e-09.