We look at the division of 859211 by 21 
We want to figure out the number of times 859211 can be divided by 21.

Going ahead to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 21

Step 2:
If we divide 85 by 21, we get 4 and a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 84 from 85 to get 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 21

Let's proceed to step 3:
21 goes into 19 0 times with a remainder of 19.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Subtracting 0 from 19 leaves us with 19.
Append the next digit (2) from the dividend to 19 and continue with: 192 / 21

Moving on to step 4:
If we divide 192 by 21, we get 9 and a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 409.0
The remainder is 3 after subtracting 189 from 192.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 21

Moving on to step 5:
31 divided by 21 is 1 with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 4091.0
Deduct 21 from 31 and we're left with 10.
Take the next digit (1) from the dividend and append it to 10, then repeat: 101 / 21

Moving on to step 6:
101 divided by 21 is 4 with a remainder of 17.
Use 4 as the next digit of our solution. 
Result so far: 40914.0
Deduct 84 from 101 and we're left 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.

Advancing to step 7:
If we divide 170 by 21, we get 8 and a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 40914.8
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 40914.8
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 9:
If we divide 200 by 21, we get 9 and a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 40914.809
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 10:
21 goes into 110 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 40914.8095
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.

On to step 11:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 40914.80952
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.

Going ahead to step 12:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 40914.809523
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.

Moving on to step 13:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 40914.8095238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 14:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 40914.8095238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 40914.8095238, and the remainder is 2e-08.