We're dividing 836570 by 21 
We want to divide 836570 by 21.

Advancing to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 21

Moving on to step 2:
21 can be fit into 83 3 times, resulting in a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 63 from 83 leaves us with 20.
Bring next digit (6) of the dividend behind the 20 and repeat the process: 206 / 21

On to step 3:
206 divided by 21 is 9 with a remainder of 17.
The next digit of our result is 9. 
Result so far: 39.0
Subtract 189 from 206 to get 17.
Include the next digit (5) from the dividend after 17, then repeat: 175 / 21

Let's proceed to step 4:
175 divided by 21 is 8 with a remainder of 7.
Write down 8 as next digit of the result. 
Result so far: 398.0
If we subtract 168 from 175, we get 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 21

Let's proceed to step 5:
The number 21 fits into 77 3 times, leaving a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 3983.0
If we take 63 away from 77, we end up with 14.
Take the next digit (0) from the dividend and append it to 14, then repeat: 140 / 21

Advancing to step 6:
If we divide 140 by 21, we get 6 and a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 39836.0
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 7:
140 divided by 21 is 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 39836.6
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
140 divided by 21 is 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 39836.66
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The quotient of the division is 39836.66, and the remainder is 0.014.