139616 ÷ 21 
We want to divide 139616 by 21.

Going ahead to step 1:
21 can be fit into 1 0 times, resulting in a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 21

Going ahead to step 2:
21 can be fit into 13 0 times, resulting in a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 21

Step 3:
When dividing 139 by 21, we get 6 with a remainder of 13.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 126 from 139 and we're left with 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 21

Step 4:
If we divide 136 by 21, we get 6 and a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 66.0
Deduct 126 from 136 and we're left with 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 21

Advancing to step 5:
21 can be fit into 101 4 times, resulting in a remainder of 17.
Use 4 as the next digit of our solution. 
Result so far: 664.0
If we subtract 84 from 101, we get 17.
Take the next digit (6) from the dividend and append it to 17, then repeat: 176 / 21

Going ahead to step 6:
21 goes into 176 8 times with a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 6648.0
If we take 168 away from 176, 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.

Going ahead to step 7:
When dividing 80 by 21, we get 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 6648.3
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 8:
If we divide 170 by 21, we get 8 and a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 6648.38
If we subtract 168 from 170, we 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.

Advancing to step 9:
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: 6648.38
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.

Moving on to step 10:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 6648.3809
The remainder is 11 after subtracting 189 from 200.
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 11:
When dividing 110 by 21, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 6648.38095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 12:
If we divide 50 by 21, we get 2 and a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 6648.380952
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.

Moving on to step 13:
If we divide 80 by 21, we get 3 and a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 6648.3809523
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 6648.38095238
Deduct 168 from 170 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.

In conclusion, the division gives 6648.38095238 with a balance of 2e-09.