62405207 divided by 21 
The aim is to understand the frequency of 21 in 62405207.

Advancing to step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 21

Advancing to step 2:
21 goes into 62 2 times with a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 42 from 62, we get 20.
Append the next digit (4) from the dividend to 20 and continue with: 204 / 21

Advancing to step 3:
The number 21 fits into 204 9 times, leaving a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Subtract 189 from 204 to get 15.
Fetch the next digit (0) from the dividend, attach it to 15 and continue: 150 / 21

Going ahead to step 4:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 297.0
Subtract 147 from 150 to get 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 21

Moving on to step 5:
35 divided by 21 is 1 with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 2971.0
If we take 21 away from 35, we end up with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 21

On to step 6:
The number 21 fits into 142 6 times, leaving a remainder of 16.
The number 6 becomes the next digit in our result. 
Result so far: 29716.0
If we take 126 away from 142, we end up with 16.
Bring next digit (0) of the dividend behind the 16 and repeat the process: 160 / 21

On to step 7:
21 goes into 160 7 times with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 297167.0
The remainder is 13 after subtracting 147 from 160.
Bring next digit (7) of the dividend behind the 13 and repeat the process: 137 / 21

Let's proceed to step 8:
If we divide 137 by 21, we get 6 and a remainder of 11.
Use 6 as the next digit of our solution. 
Result so far: 2971676.0
If we subtract 126 from 137, 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.

Going ahead to step 9:
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: 2971676.5
Subtracting 105 from 110 leaves us with 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:
50 divided by 21 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2971676.52
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.

Let's proceed to step 11:
When dividing 80 by 21, we get 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 2971676.523
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.

Step 12:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 2971676.5238
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.

Let's proceed to step 13:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 2971676.5238
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.

Let's proceed to step 14:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 2971676.523809
If we take 189 away from 200, 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.

Let's proceed 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: 2971676.5238095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 16:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2971676.52380952
If we take 42 away from 50, we end up 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.

In conclusion, the division gives 2971676.52380952 with a balance of 8e-09.