We're dividing 29257778 by 21 
The aim is to understand the frequency of 21 in 29257778.

Moving on to step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 21

On to step 2:
21 can be fit into 29 1 times, resulting in a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 21 from 29 and we're left with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 21

Moving on to step 3:
The number 21 fits into 82 3 times, leaving a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we take 63 away from 82, we end up with 19.
Bring next digit (5) of the dividend behind the 19 and repeat the process: 195 / 21

Let's proceed to step 4:
If we divide 195 by 21, we get 9 and a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 139.0
If we subtract 189 from 195, we get 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 21

On to step 5:
21 goes into 67 3 times with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 1393.0
The remainder is 4 after subtracting 63 from 67.
Bring next digit (7) of the dividend behind the 4 and repeat the process: 47 / 21

Step 6:
21 can be fit into 47 2 times, resulting in a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 13932.0
Subtract 42 from 47 to get 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 21

Step 7:
When dividing 57 by 21, we get 2 with a remainder of 15.
Record the quotient 2 as the next digit in the result. 
Result so far: 139322.0
Deduct 42 from 57 and we're left with 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 21

Moving on to step 8:
158 divided by 21 is 7 with a remainder of 11.
The next digit of our result is 7. 
Result so far: 1393227.0
If we subtract 147 from 158, we 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.

Moving on to step 9:
If we divide 110 by 21, we get 5 and a remainder of 5.
The next digit of our result is 5. 
Result so far: 1393227.5
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 10:
If we divide 50 by 21, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 1393227.52
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.

On to step 11:
21 goes into 80 3 times with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 1393227.523
Deduct 63 from 80 and we're left 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 12:
170 divided by 21 is 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 1393227.5238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 13:
If we divide 20 by 21, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 1393227.5238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 1393227.523809
If we subtract 189 from 200, we 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 15:
If we divide 110 by 21, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 1393227.5238095
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.

Moving on to step 16:
50 divided by 21 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 1393227.52380952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 1393227.52380952 with a balance of 8e-09.