386159 divided by 21 
Let's see how many times 21 fits into 386159.

Moving on to step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 21

Let's proceed to step 2:
When dividing 38 by 21, we get 1 with a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 21 from 38 and we're left with 17.
Bring next digit (6) of the dividend behind the 17 and repeat the process: 176 / 21

Moving on to step 3:
21 can be fit into 176 8 times, resulting in a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
The remainder is 8 after subtracting 168 from 176.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 21

Going ahead to step 4:
81 divided by 21 is 3 with a remainder of 18.
The next digit of our result is 3. 
Result so far: 183.0
If we take 63 away from 81, we end up with 18.
Grab the next digit (5) from the dividend, add it to 18, then carry on: 185 / 21

Advancing to step 5:
The number 21 fits into 185 8 times, leaving a remainder of 17.
Use 8 as the next digit of our solution. 
Result so far: 1838.0
The remainder is 17 after subtracting 168 from 185.
Fetch the next digit (9) from the dividend, attach it to 17 and continue: 179 / 21

Going ahead to step 6:
21 goes into 179 8 times with a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 18388.0
If we subtract 168 from 179, we 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.

On to step 7:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 18388.5
Subtracting 105 from 110 leaves us with 5.
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 8:
If we divide 50 by 21, we get 2 and a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 18388.52
Deduct 42 from 50 and we're left 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.

Let's proceed to step 9:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 18388.523
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.

Moving on to step 10:
When dividing 170 by 21, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 18388.5238
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.

Advancing to step 11:
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: 18388.5238
If we subtract 0 from 20, we 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.

Step 12:
200 divided by 21 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 18388.523809
If we subtract 189 from 200, we 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.

Moving on to step 13:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 18388.5238095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 14:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 18388.52380952
Subtract 42 from 50 to 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.

In conclusion, the division gives 18388.52380952 with a balance of 8e-09.