We're dividing 350592 by 21 
We're looking to find how many times 21 goes into 350592.

Going ahead to step 1:
3 divided by 21 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 21

Moving on to step 2:
The number 21 fits into 35 1 times, leaving a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 21 from 35, we get 14.
Fetch the next digit (0) from the dividend, attach it to 14 and continue: 140 / 21

On to step 3:
21 goes into 140 6 times with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtracting 126 from 140 leaves us with 14.
Include the next digit (5) from the dividend after 14, then repeat: 145 / 21

Advancing to step 4:
The number 21 fits into 145 6 times, leaving a remainder of 19.
The number 6 becomes the next digit in our result. 
Result so far: 166.0
If we take 126 away from 145, we end up with 19.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 21

Going ahead to step 5:
If we divide 199 by 21, we get 9 and a remainder of 10.
The next digit of our result is 9. 
Result so far: 1669.0
If we take 189 away from 199, we end up with 10.
Grab the next digit (2) from the dividend, add it to 10, then carry on: 102 / 21

On to step 6:
102 divided by 21 is 4 with a remainder of 18.
The number 4 becomes the next digit in our result. 
Result so far: 16694.0
If we subtract 84 from 102, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 16694.8
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 16694.85
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 16694.857
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.

Step 10:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 16694.8571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 16694.85714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 12:
21 goes into 60 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 16694.857142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 16694.8571428
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 14:
If we divide 120 by 21, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 16694.85714285
Subtracting 105 from 120 leaves us 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.

Our division results in 16694.85714285 with a remaining 1.5e-08.