We look at the division of 528590 by 21 
We're looking to find how many times 21 goes into 528590.

Moving on to step 1:
5 divided by 21 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 21

Moving on to step 2:
If we divide 52 by 21, we get 2 and a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 42 from 52, we get 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 21

Step 3:
If we divide 108 by 21, we get 5 and a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
Deduct 105 from 108 and we're left with 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 21

On to step 4:
21 can be fit into 35 1 times, resulting in a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 251.0
If we subtract 21 from 35, we get 14.
Take the next digit (9) from the dividend and append it to 14, then repeat: 149 / 21

Step 5:
149 divided by 21 is 7 with a remainder of 2.
The number 7 becomes the next digit in our result. 
Result so far: 2517.0
Deduct 147 from 149 and we're left with 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 21

On to step 6:
21 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 25170.0
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.

On to step 7:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 25170.9
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.

Let's proceed to step 8:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 25170.95
If we subtract 105 from 110, we 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 9:
21 goes into 50 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 25170.952
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.

Moving on to step 10:
80 divided by 21 is 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 25170.9523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 11:
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: 25170.95238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 12:
If we divide 20 by 21, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 25170.95238
Subtracting 0 from 20 leaves us 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.

Advancing to step 13:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 25170.9523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 25170.95238095
If we subtract 105 from 110, we 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.

The quotient of the division is 25170.95238095, and the remainder is 5e-09.