We divide 494708 by 21
The aim is to understand the frequency of 21 in 494708.

Step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 21

Advancing to step 2:
The number 21 fits into 49 2 times, leaving a remainder of 7.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 42 from 49 to get 7.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 21

Moving on to step 3:
21 can be fit into 74 3 times, resulting in a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
Deduct 63 from 74 and we're left with 11.
Fetch the next digit (7) from the dividend, attach it to 11 and continue: 117 / 21

Going ahead to step 4:
21 goes into 117 5 times with a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 235.0
If we subtract 105 from 117, we get 12.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 21

Going ahead to step 5:
When dividing 120 by 21, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 2355.0
If we take 105 away from 120, we end up with 15.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 21

Let's proceed to step 6:
21 goes into 158 7 times with a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 23557.0
Subtracting 147 from 158 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.

Step 7:
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: 23557.5
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
21 goes into 50 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 23557.52
Subtract 42 from 50 to get 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 9:
21 goes into 80 3 times with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 23557.523
Subtracting 63 from 80 leaves us 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.

Let's proceed to step 10:
When dividing 170 by 21, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 23557.5238
Deduct 168 from 170 and we're left 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.

On to step 11:
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: 23557.5238
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.

Moving on to step 12:
200 divided by 21 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 23557.523809
Subtract 189 from 200 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.

Let's proceed to step 13:
21 goes into 110 5 times with a remainder of 5.
The next digit of our result is 5. 
Result so far: 23557.5238095
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 14:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 23557.52380952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Our division results in 23557.52380952 with a remaining 8e-09.