256346 divided by 21 
The aim is to understand the frequency of 21 in 256346.

Let's proceed to step 1:
21 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 21

Moving on to step 2:
21 can be fit into 25 1 times, resulting in a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 21 from 25 to get 4.
Bring next digit (6) of the dividend behind the 4 and repeat the process: 46 / 21

Advancing to step 3:
When dividing 46 by 21, we get 2 with a remainder of 4.
The next digit of our result is 2. 
Result so far: 12.0
The remainder is 4 after subtracting 42 from 46.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 21

Step 4:
If we divide 43 by 21, we get 2 and a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 122.0
Subtract 42 from 43 to get 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 21

On to step 5:
When dividing 14 by 21, we get 0 with a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 1220.0
If we subtract 0 from 14, we get 14.
Include the next digit (6) from the dividend after 14, then repeat: 146 / 21

Step 6:
The number 21 fits into 146 6 times, leaving a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 12206.0
Deduct 126 from 146 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 7:
When dividing 200 by 21, we get 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 12206.9
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.

Step 8:
The number 21 fits into 110 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 12206.95
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.

Moving on to step 9:
When dividing 50 by 21, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 12206.952
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.

Step 10:
If we divide 80 by 21, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 12206.9523
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 11:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 12206.95238
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.

Going ahead to step 12:
When dividing 20 by 21, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 12206.95238
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.

Advancing to step 13:
21 goes into 200 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 12206.9523809
The remainder is 11 after subtracting 189 from 200.
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 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 12206.95238095
Deduct 105 from 110 and we're left 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.

The quotient of the division is 12206.95238095, and the remainder is 5e-09.