531837 divided by 21 
Our goal is to divide 531837 by 21.

Going ahead to step 1:
5 divided by 21 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 21

Step 2:
The number 21 fits into 53 2 times, leaving a remainder of 11.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 42 from 53 to get 11.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 21

Advancing to step 3:
21 can be fit into 111 5 times, resulting in a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 25.0
If we subtract 105 from 111, we get 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 21

Moving on to step 4:
If we divide 68 by 21, we get 3 and a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 253.0
Subtracting 63 from 68 leaves us with 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 21

Step 5:
21 can be fit into 53 2 times, resulting in a remainder of 11.
The number 2 becomes the next digit in our result. 
Result so far: 2532.0
Subtract 42 from 53 to get 11.
Fetch the next digit (7) from the dividend, attach it to 11 and continue: 117 / 21

Advancing to step 6:
21 goes into 117 5 times with a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 25325.0
Subtracting 105 from 117 leaves us 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 7:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 25325.5
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 8:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 25325.57
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 9:
The number 21 fits into 30 1 times, leaving a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 25325.571
Subtracting 21 from 30 leaves us 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.

Going ahead to step 10:
If we divide 90 by 21, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 25325.5714
If we take 84 away from 90, we end up with 6.
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 11:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 25325.57142
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.

Let's proceed to step 12:
If we divide 180 by 21, we get 8 and a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 25325.571428
Deduct 168 from 180 and we're left 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.

Let's proceed to step 13:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 25325.5714285
Subtract 105 from 120 to 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.

Moving on to step 14:
150 divided by 21 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 25325.57142857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Our division results in 25325.57142857 with a remaining 3e-09.