We look at the division of 401516 by 21 
Let's see how many times 21 fits into 401516.

Step 1:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 21

Moving on to step 2:
21 goes into 40 1 times with a remainder of 19.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 21 from 40 to get 19.
Include the next digit (1) from the dividend after 19, then repeat: 191 / 21

Step 3:
If we divide 191 by 21, we get 9 and a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we subtract 189 from 191, we get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 21

Step 4:
If we divide 25 by 21, we get 1 and a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 191.0
Subtract 21 from 25 to get 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 21

Moving on to step 5:
If we divide 41 by 21, we get 1 and a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 1911.0
If we take 21 away from 41, we end up with 20.
Take the next digit (6) from the dividend and append it to 20, then repeat: 206 / 21

On to step 6:
When dividing 206 by 21, we get 9 with a remainder of 17.
Put 9 as the next digit of the answer. 
Result so far: 19119.0
If we subtract 189 from 206, 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.

Going ahead to step 7:
When dividing 170 by 21, we get 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 19119.8
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
If we divide 20 by 21, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 19119.8
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
If we divide 200 by 21, we get 9 and a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 19119.809
Subtract 189 from 200 to 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.

Step 10:
110 divided by 21 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 19119.8095
If we subtract 105 from 110, we 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.

Step 11:
50 divided by 21 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 19119.80952
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 12:
If we divide 80 by 21, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 19119.809523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 13:
21 can be fit into 170 8 times, resulting in a remainder of 2.
The next digit of our result is 8. 
Result so far: 19119.8095238
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:
If we divide 20 by 21, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 19119.8095238
Subtract 0 from 20 to 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 19119.8095238, and the remainder is 2e-08.