21035686 ÷ 581 
We want to divide 21035686 by 581.

On to step 1:
2 divided by 581 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 581

Moving on to step 2:
The number 581 fits into 21 0 times, leaving a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 581

Advancing to step 3:
When dividing 210 by 581, we get 0 with a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 210 and we're left with 210.
Include the next digit (3) from the dividend after 210, then repeat: 2103 / 581

Moving on to step 4:
2103 divided by 581 is 3 with a remainder of 360.
The next digit of our result is 3. 
Result so far: 3.0
If we take 1743 away from 2103, we end up with 360.
Include the next digit (5) from the dividend after 360, then repeat: 3605 / 581

On to step 5:
The number 581 fits into 3605 6 times, leaving a remainder of 119.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
The remainder is 119 after subtracting 3486 from 3605.
Take the next digit (6) from the dividend and append it to 119, then repeat: 1196 / 581

Going ahead to step 6:
581 can be fit into 1196 2 times, resulting in a remainder of 34.
The number 2 becomes the next digit in our result. 
Result so far: 362.0
If we take 1162 away from 1196, we end up with 34.
Fetch the next digit (8) from the dividend, attach it to 34 and continue: 348 / 581

Going ahead to step 7:
If we divide 348 by 581, we get 0 and a remainder of 348.
The next digit of our result is 0. 
Result so far: 3620.0
Deduct 0 from 348 and we're left with 348.
Grab the next digit (6) from the dividend, add it to 348, then carry on: 3486 / 581

Step 8:
3486 divided by 581 is 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 36206.0
If we take 3486 away from 3486, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
581 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 36206.0
If we subtract 0 from 0, we 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.

Going ahead to step 10:
When dividing 0 by 581, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 36206.0
If we take 0 away from 0, we end up with 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 36206.0, and the remainder is 0.0.