We're dividing 284257 by 21 
Let's see how many times 21 fits into 284257.

Step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 21

Going ahead to step 2:
The number 21 fits into 28 1 times, leaving a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 21 from 28 leaves us with 7.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 21

Going ahead to step 3:
21 can be fit into 74 3 times, resulting in a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we take 63 away from 74, we end up with 11.
Include the next digit (2) from the dividend after 11, then repeat: 112 / 21

Advancing to step 4:
112 divided by 21 is 5 with a remainder of 7.
The next digit of our result is 5. 
Result so far: 135.0
Deduct 105 from 112 and we're left with 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 21

Advancing to step 5:
21 can be fit into 75 3 times, resulting in a remainder of 12.
The number 3 becomes the next digit in our result. 
Result so far: 1353.0
Subtracting 63 from 75 leaves us with 12.
Bring next digit (7) of the dividend behind the 12 and repeat the process: 127 / 21

Step 6:
21 goes into 127 6 times with a remainder of 1.
The next digit of our result is 6. 
Result so far: 13536.0
Deduct 126 from 127 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
When dividing 10 by 21, we get 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 13536.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
21 goes into 100 4 times with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 13536.04
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 9:
When dividing 160 by 21, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 13536.047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 10:
130 divided by 21 is 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 13536.0476
If we take 126 away from 130, we end up 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.

On to step 11:
When dividing 40 by 21, we get 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 13536.04761
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.

Let's proceed to step 12:
When dividing 190 by 21, we get 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 13536.047619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 13:
21 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 13536.047619
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 14:
100 divided by 21 is 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 13536.04761904
Subtracting 84 from 100 leaves us 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.

The quotient of the division is 13536.04761904, and the remainder is 1.6e-08.