We look at the division of 869593 by 21 
We're looking to find how many times 21 goes into 869593.

On to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 21

Moving on to step 2:
The number 21 fits into 86 4 times, leaving a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 84 from 86, we get 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 21

Advancing to step 3:
29 divided by 21 is 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 41.0
Subtracting 21 from 29 leaves us with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 21

Let's proceed to step 4:
When dividing 85 by 21, we get 4 with a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 414.0
The remainder is 1 after subtracting 84 from 85.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 21

Going ahead to step 5:
21 can be fit into 19 0 times, resulting in a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 4140.0
If we take 0 away from 19, we end up with 19.
Include the next digit (3) from the dividend after 19, then repeat: 193 / 21

Moving on to step 6:
21 can be fit into 193 9 times, resulting in a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 41409.0
The remainder is 4 after subtracting 189 from 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
The number 21 fits into 40 1 times, leaving a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 41409.1
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 8:
The number 21 fits into 190 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 41409.19
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
When dividing 10 by 21, we get 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 41409.19
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
When dividing 100 by 21, we get 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 41409.1904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 11:
When dividing 160 by 21, we get 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 41409.19047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 12:
130 divided by 21 is 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 41409.190476
If we take 126 away from 130, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 13:
When dividing 40 by 21, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 41409.1904761
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 14:
When dividing 190 by 21, we get 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 41409.19047619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The quotient of the division is 41409.19047619, and the remainder is 1e-09.