We look at the division of 24447696 by 21 
The aim is to understand the frequency of 21 in 24447696.

Step 1:
2 divided by 21 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 21

Let's proceed to step 2:
When dividing 24 by 21, we get 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 21 from 24 and we're left with 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 21

Step 3:
The number 21 fits into 34 1 times, leaving a remainder of 13.
Use 1 as the next digit of our solution. 
Result so far: 11.0
Subtract 21 from 34 to get 13.
Append the next digit (4) from the dividend to 13 and continue with: 134 / 21

Advancing to step 4:
When dividing 134 by 21, we get 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 116.0
If we subtract 126 from 134, we get 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 21

On to step 5:
If we divide 87 by 21, we get 4 and a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 1164.0
The remainder is 3 after subtracting 84 from 87.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 21

Going ahead to step 6:
21 goes into 36 1 times with a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 11641.0
Subtracting 21 from 36 leaves us with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 21

Going ahead to step 7:
159 divided by 21 is 7 with a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 116417.0
The remainder is 12 after subtracting 147 from 159.
Append the next digit (6) from the dividend to 12 and continue with: 126 / 21

Let's proceed to step 8:
The number 21 fits into 126 6 times, leaving a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 1164176.0
If we subtract 126 from 126, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
0 divided by 21 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 1164176.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
The number 21 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 1164176.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 1164176.0, and the remainder is 0.0.