We divide 496016 by 21
The aim is to understand the frequency of 21 in 496016.

Advancing to step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 21

Going ahead to step 2:
21 goes into 49 2 times with a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 42 from 49 and we're left with 7.
Grab the next digit (6) from the dividend, add it to 7, then carry on: 76 / 21

Advancing to step 3:
If we divide 76 by 21, we get 3 and a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 23.0
Subtracting 63 from 76 leaves us with 13.
Bring next digit (0) of the dividend behind the 13 and repeat the process: 130 / 21

On to step 4:
21 can be fit into 130 6 times, resulting in a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 236.0
Deduct 126 from 130 and we're left with 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 21

Let's proceed to step 5:
The number 21 fits into 41 1 times, leaving a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 2361.0
The remainder is 20 after subtracting 21 from 41.
Fetch the next digit (6) from the dividend, attach it to 20 and continue: 206 / 21

Moving on to step 6:
206 divided by 21 is 9 with a remainder of 17.
The number 9 becomes the next digit in our result. 
Result so far: 23619.0
Subtracting 189 from 206 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 7:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 23619.8
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.

Let's proceed to step 8:
20 divided by 21 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 23619.8
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.

Let's proceed to step 9:
200 divided by 21 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 23619.809
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.

Step 10:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 23619.8095
Subtract 105 from 110 to 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.

On to step 11:
50 divided by 21 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 23619.80952
Subtracting 42 from 50 leaves us 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.

Moving on to step 12:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 23619.809523
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.

Let's proceed to step 13:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 23619.8095238
Subtract 168 from 170 to 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.

On to step 14:
20 divided by 21 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 23619.8095238
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.

After the division, we end up with 23619.8095238 and a remainder of 2e-08.