We're dividing 21385170 by 6 
Let's see how many times 6 fits into 21385170.

On to step 1:
6 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 6

On to step 2:
6 goes into 21 3 times with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 18 away from 21, we end up with 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 6

On to step 3:
If we divide 33 by 6, we get 5 and a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
The remainder is 3 after subtracting 30 from 33.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 6

Moving on to step 4:
6 goes into 38 6 times with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 356.0
If we subtract 36 from 38, we get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 6

Advancing to step 5:
The number 6 fits into 25 4 times, leaving a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 3564.0
Deduct 24 from 25 and we're left with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 6

On to step 6:
If we divide 11 by 6, we get 1 and a remainder of 5.
The next digit of our result is 1. 
Result so far: 35641.0
If we subtract 6 from 11, we get 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 6

Going ahead to step 7:
The number 6 fits into 57 9 times, leaving a remainder of 3.
Write down 9 as next digit of the result. 
Result so far: 356419.0
If we take 54 away from 57, we end up with 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 6

Advancing to step 8:
6 can be fit into 30 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 3564195.0
The remainder is 0 after subtracting 30 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
6 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 3564195.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
0 divided by 6 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 3564195.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 3564195.0 and a remainder of 0.0.