We're dividing 536452 by 21 
Our goal is to divide 536452 by 21.

Step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 21

On to step 2:
21 goes into 53 2 times with a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 42 from 53 and we're left with 11.
Fetch the next digit (6) from the dividend, attach it to 11 and continue: 116 / 21

Moving on to step 3:
If we divide 116 by 21, we get 5 and a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
If we take 105 away from 116, we end up with 11.
Bring next digit (4) of the dividend behind the 11 and repeat the process: 114 / 21

Going ahead to step 4:
21 goes into 114 5 times with a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 255.0
Subtracting 105 from 114 leaves us with 9.
Include the next digit (5) from the dividend after 9, then repeat: 95 / 21

On to step 5:
21 can be fit into 95 4 times, resulting in a remainder of 11.
The next digit of our result is 4. 
Result so far: 2554.0
Subtracting 84 from 95 leaves us with 11.
Include the next digit (2) from the dividend after 11, then repeat: 112 / 21

Step 6:
21 goes into 112 5 times with a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 25545.0
Subtracting 105 from 112 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
70 divided by 21 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 25545.3
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 25545.33
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 25545.33, and the remainder is 0.007.