585276 ÷ 21 
Let's see how many times 21 fits into 585276.

Advancing to step 1:
5 divided by 21 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 21

On to step 2:
The number 21 fits into 58 2 times, leaving a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 42 away from 58, we end up with 16.
Fetch the next digit (5) from the dividend, attach it to 16 and continue: 165 / 21

Advancing to step 3:
165 divided by 21 is 7 with a remainder of 18.
Use 7 as the next digit of our solution. 
Result so far: 27.0
If we take 147 away from 165, we end up with 18.
Append the next digit (2) from the dividend to 18 and continue with: 182 / 21

Let's proceed to step 4:
21 can be fit into 182 8 times, resulting in a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 278.0
Subtract 168 from 182 to get 14.
Include the next digit (7) from the dividend after 14, then repeat: 147 / 21

Going ahead to step 5:
When dividing 147 by 21, we get 7 with a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 2787.0
The remainder is 0 after subtracting 147 from 147.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 21

Let's proceed to step 6:
21 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 27870.0
Subtract 0 from 6 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 27870.2
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 8:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 27870.28
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
When dividing 120 by 21, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 27870.285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 10:
If we divide 150 by 21, we get 7 and a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 27870.2857
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 11:
When dividing 30 by 21, we get 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 27870.28571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 12:
90 divided by 21 is 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 27870.285714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 13:
21 goes into 60 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 27870.2857142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 14:
180 divided by 21 is 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 27870.28571428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 27870.28571428, and the remainder is 1.2e-08.