We divide 21050538 by 3
Let's see how many times 3 fits into 21050538.

Going ahead to step 1:
The number 3 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 3

Step 2:
3 can be fit into 21 7 times, resulting in a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 21 from 21, we get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 3

Step 3:
3 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 70.0
Subtract 0 from 0 to get 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 3

Step 4:
3 goes into 5 1 times with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 701.0
The remainder is 2 after subtracting 3 from 5.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 3

Moving on to step 5:
When dividing 20 by 3, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 7016.0
If we subtract 18 from 20, we get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 3

Advancing to step 6:
The number 3 fits into 25 8 times, leaving a remainder of 1.
The next digit of our result is 8. 
Result so far: 70168.0
Deduct 24 from 25 and we're left with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 3

Advancing to step 7:
The number 3 fits into 13 4 times, leaving a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 701684.0
If we take 12 away from 13, we end up with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 3

On to step 8:
When dividing 18 by 3, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 7016846.0
If we take 18 away from 18, we end up 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.

On to step 9:
3 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7016846.0
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.

Going ahead to step 10:
The number 3 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 7016846.0
If we subtract 0 from 0, we 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.

The final result is 7016846.0 with a remainder of 0.0.