21573 ÷ 14 
We're looking to find how many times 14 goes into 21573.

Moving on to step 1:
14 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 14

Going ahead to step 2:
If we divide 21 by 14, we get 1 and a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 14 away from 21, we end up with 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 14

Step 3:
14 can be fit into 75 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 5 after subtracting 70 from 75.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 14

On to step 4:
The number 14 fits into 57 4 times, leaving a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 154.0
Subtracting 56 from 57 leaves us with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 14

Let's proceed to step 5:
When dividing 13 by 14, we get 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 1540.0
If we take 0 away from 13, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 6:
14 goes into 130 9 times with a remainder of 4.
Put 9 as the next digit of the answer. 
Result so far: 1540.9
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.

Moving on to step 7:
14 goes into 40 2 times with a remainder of 12.
The next digit of our result is 2. 
Result so far: 1540.92
If we take 28 away from 40, 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.

Advancing to step 8:
When dividing 120 by 14, we get 8 with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 1540.928
If we take 112 away from 120, we end up 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.

On to step 9:
14 can be fit into 80 5 times, resulting in a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 1540.9285
If we subtract 70 from 80, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
When dividing 100 by 14, we get 7 with a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 1540.92857
Deduct 98 from 100 and we're left with 2.
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:
20 divided by 14 is 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 1540.928571
The remainder is 6 after subtracting 14 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 12:
14 goes into 60 4 times with a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 1540.9285714
Deduct 56 from 60 and we're left 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.

Step 13:
14 can be fit into 40 2 times, resulting in a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 1540.92857142
The remainder is 12 after subtracting 28 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 1540.92857142 with a remainder of 1.2e-08.