We look at the division of 530801 by 21 
Let's see how many times 21 fits into 530801.

Going ahead to step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 21

Step 2:
If we divide 53 by 21, we get 2 and a remainder of 11.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 42 away from 53, we end up with 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 21

Let's proceed to step 3:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
Deduct 105 from 110 and we're left with 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 21

On to step 4:
58 divided by 21 is 2 with a remainder of 16.
The next digit of our result is 2. 
Result so far: 252.0
If we take 42 away from 58, we end up with 16.
Grab the next digit (0) from the dividend, add it to 16, then carry on: 160 / 21

Step 5:
160 divided by 21 is 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 2527.0
The remainder is 13 after subtracting 147 from 160.
Bring next digit (1) of the dividend behind the 13 and repeat the process: 131 / 21

Let's proceed to step 6:
When dividing 131 by 21, we get 6 with a remainder of 5.
Use 6 as the next digit of our solution. 
Result so far: 25276.0
If we subtract 126 from 131, 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.

Let's proceed to step 7:
50 divided by 21 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 25276.2
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.

Let's proceed to step 8:
When dividing 80 by 21, we get 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 25276.23
If we subtract 63 from 80, we 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.

Advancing to step 9:
When dividing 170 by 21, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 25276.238
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 10:
If we divide 20 by 21, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 25276.238
If we take 0 away from 20, we end up 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.

Step 11:
21 goes into 200 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 25276.23809
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 12:
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: 25276.238095
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.

Advancing to step 13:
50 divided by 21 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 25276.2380952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 14:
80 divided by 21 is 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 25276.23809523
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.

The final result is 25276.23809523 with a remainder of 1.7e-08.