We look at the division of 40006063 by 21 
Let's see how many times 21 fits into 40006063.

Going ahead to step 1:
21 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 21

Advancing to step 2:
21 can be fit into 40 1 times, resulting in a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 21 from 40, we get 19.
Take the next digit (0) from the dividend and append it to 19, then repeat: 190 / 21

Moving on to step 3:
190 divided by 21 is 9 with a remainder of 1.
The next digit of our result is 9. 
Result so far: 19.0
If we take 189 away from 190, we end up with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 21

Moving on to step 4:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 190.0
The remainder is 10 after subtracting 0 from 10.
Take the next digit (6) from the dividend and append it to 10, then repeat: 106 / 21

Advancing to step 5:
If we divide 106 by 21, we get 5 and a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 1905.0
Subtract 105 from 106 to get 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 21

Moving on to step 6:
If we divide 10 by 21, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 19050.0
If we take 0 away from 10, we end up with 10.
Append the next digit (6) from the dividend to 10 and continue with: 106 / 21

Step 7:
21 goes into 106 5 times with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 190505.0
If we subtract 105 from 106, we get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 21

Going ahead to step 8:
13 divided by 21 is 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 1905050.0
The remainder is 13 after subtracting 0 from 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 9:
21 goes into 130 6 times with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 1905050.6
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 10:
21 goes into 40 1 times with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 1905050.61
Deduct 21 from 40 and we're left 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.

On to step 11:
21 can be fit into 190 9 times, resulting in a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 1905050.619
The remainder is 1 after subtracting 189 from 190.
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 12:
21 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 1905050.619
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.

Step 13:
If we divide 100 by 21, we get 4 and a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 1905050.61904
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 14:
If we divide 160 by 21, we get 7 and a remainder of 13.
The next digit of our result is 7. 
Result so far: 1905050.619047
Deduct 147 from 160 and we're left 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.

Advancing to step 15:
130 divided by 21 is 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 1905050.6190476
Deduct 126 from 130 and we're left 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.

Step 16:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1905050.61904761
If we take 21 away from 40, we end up 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.

The quotient of the division is 1905050.61904761, and the remainder is 1.9e-08.