558143 divided by 21 
Our goal is to divide 558143 by 21.

Step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 21

Going ahead to step 2:
If we divide 55 by 21, we get 2 and a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 42 from 55, we get 13.
Take the next digit (8) from the dividend and append it to 13, then repeat: 138 / 21

Going ahead to step 3:
21 can be fit into 138 6 times, resulting in a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
If we subtract 126 from 138, we get 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 21

Going ahead to step 4:
121 divided by 21 is 5 with a remainder of 16.
Use 5 as the next digit of our solution. 
Result so far: 265.0
The remainder is 16 after subtracting 105 from 121.
Append the next digit (4) from the dividend to 16 and continue with: 164 / 21

On to step 5:
164 divided by 21 is 7 with a remainder of 17.
The next digit of our result is 7. 
Result so far: 2657.0
If we take 147 away from 164, we end up with 17.
Append the next digit (3) from the dividend to 17 and continue with: 173 / 21

On to step 6:
The number 21 fits into 173 8 times, leaving a remainder of 5.
Record the quotient 8 as the next digit in the result. 
Result so far: 26578.0
Subtract 168 from 173 to 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.

On to step 7:
If we divide 50 by 21, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 26578.2
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 8:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 26578.23
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 9:
21 goes into 170 8 times with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 26578.238
The remainder is 2 after subtracting 168 from 170.
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 10:
20 divided by 21 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 26578.238
Deduct 0 from 20 and we're left 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.

Going ahead to step 11:
200 divided by 21 is 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 26578.23809
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 12:
If we divide 110 by 21, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 26578.238095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 13:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 26578.2380952
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.

Going ahead to step 14:
21 goes into 80 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 26578.23809523
If we subtract 63 from 80, 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.

In conclusion, the division gives 26578.23809523 with a balance of 1.7e-08.