21939 divided by 13 
Let's see how many times 13 fits into 21939.

Moving on to step 1:
13 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
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 / 13

Advancing to step 2:
When dividing 21 by 13, we get 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 13 away from 21, we end up with 8.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 13

Advancing to step 3:
89 divided by 13 is 6 with a remainder of 11.
Put 6 as the next digit of the answer. 
Result so far: 16.0
The remainder is 11 after subtracting 78 from 89.
Bring next digit (3) of the dividend behind the 11 and repeat the process: 113 / 13

Let's proceed to step 4:
13 can be fit into 113 8 times, resulting in a remainder of 9.
The next digit of our result is 8. 
Result so far: 168.0
The remainder is 9 after subtracting 104 from 113.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 13

Going ahead to step 5:
13 goes into 99 7 times with a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 1687.0
The remainder is 8 after subtracting 91 from 99.
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 6:
13 goes into 80 6 times with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 1687.6
Subtract 78 from 80 to get 2.
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 7:
When dividing 20 by 13, we get 1 with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1687.61
If we subtract 13 from 20, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 8:
13 can be fit into 70 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 1687.615
Deduct 65 from 70 and we're left 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.

On to step 9:
The number 13 fits into 50 3 times, leaving a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 1687.6153
Subtract 39 from 50 to 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.

Step 10:
If we divide 110 by 13, we get 8 and a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 1687.61538
If we subtract 104 from 110, we 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.

Moving on to step 11:
13 goes into 60 4 times with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 1687.615384
If we take 52 away from 60, 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.

Let's proceed to step 12:
13 goes into 80 6 times with a remainder of 2.
The next digit of our result is 6. 
Result so far: 1687.6153846
The remainder is 2 after subtracting 78 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 13:
If we divide 20 by 13, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 1687.61538461
The remainder is 7 after subtracting 13 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 1687.61538461, and the remainder is 7e-09.