We look at the division of 21069834 by 256 
Let's see how many times 256 fits into 21069834.

Moving on to step 1:
256 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
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 256

Going ahead to step 2:
The number 256 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (0) from the dividend, add it to 21, then carry on: 210 / 256

Moving on to step 3:
256 can be fit into 210 0 times, resulting in a remainder of 210.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 210 after subtracting 0 from 210.
Fetch the next digit (6) from the dividend, attach it to 210 and continue: 2106 / 256

On to step 4:
The number 256 fits into 2106 8 times, leaving a remainder of 58.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 58 after subtracting 2048 from 2106.
Fetch the next digit (9) from the dividend, attach it to 58 and continue: 589 / 256

Advancing to step 5:
256 can be fit into 589 2 times, resulting in a remainder of 77.
The number 2 becomes the next digit in our result. 
Result so far: 82.0
The remainder is 77 after subtracting 512 from 589.
Append the next digit (8) from the dividend to 77 and continue with: 778 / 256

Step 6:
256 goes into 778 3 times with a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 823.0
The remainder is 10 after subtracting 768 from 778.
Append the next digit (3) from the dividend to 10 and continue with: 103 / 256

Going ahead to step 7:
The number 256 fits into 103 0 times, leaving a remainder of 103.
Use 0 as the next digit of our solution. 
Result so far: 8230.0
If we take 0 away from 103, we end up with 103.
Append the next digit (4) from the dividend to 103 and continue with: 1034 / 256

Advancing to step 8:
256 goes into 1034 4 times with a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 82304.0
Deduct 1024 from 1034 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
When dividing 100 by 256, we get 0 with a remainder of 100.
Put 0 as the next digit of the answer. 
Result so far: 82304.0
Deduct 0 from 100 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 10:
The number 256 fits into 1000 3 times, leaving a remainder of 232.
The number 3 becomes the next digit in our result. 
Result so far: 82304.03
Subtracting 768 from 1000 leaves us with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

On to step 11:
If we divide 2320 by 256, we get 9 and a remainder of 16.
Write down 9 as next digit of the result. 
Result so far: 82304.039
If we take 2304 away from 2320, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 12:
256 can be fit into 160 0 times, resulting in a remainder of 160.
Put 0 as the next digit of the answer. 
Result so far: 82304.039
Subtract 0 from 160 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 13:
If we divide 1600 by 256, we get 6 and a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 82304.03906
If we subtract 1536 from 1600, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 14:
256 can be fit into 640 2 times, resulting in a remainder of 128.
Use 2 as the next digit of our solution. 
Result so far: 82304.039062
If we subtract 512 from 640, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 15:
1280 divided by 256 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 82304.0390625
Subtract 1280 from 1280 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 16:
The number 256 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 82304.0390625
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 82304.0390625, and the remainder is 0.0.