We look at the division of 354861 by 21 
Our goal is to divide 354861 by 21.

On to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 21

Advancing to step 2:
21 goes into 35 1 times with a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 21 away from 35, we end up with 14.
Append the next digit (4) from the dividend to 14 and continue with: 144 / 21

Going ahead to step 3:
The number 21 fits into 144 6 times, leaving a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Deduct 126 from 144 and we're left with 18.
Grab the next digit (8) from the dividend, add it to 18, then carry on: 188 / 21

Moving on to step 4:
The number 21 fits into 188 8 times, leaving a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 168.0
Subtracting 168 from 188 leaves us with 20.
Fetch the next digit (6) from the dividend, attach it to 20 and continue: 206 / 21

Moving on to step 5:
The number 21 fits into 206 9 times, leaving a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 1689.0
Subtracting 189 from 206 leaves us with 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 21

Moving on to step 6:
21 goes into 171 8 times with a remainder of 3.
The next digit of our result is 8. 
Result so far: 16898.0
If we take 168 away from 171, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
30 divided by 21 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 16898.1
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 8:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 16898.14
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 16898.142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 10:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 16898.1428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 11:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 16898.14285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 12:
150 divided by 21 is 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 16898.142857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 13:
21 goes into 30 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 16898.1428571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 14:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 16898.14285714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 16898.14285714 with a balance of 6e-09.