We're dividing 213621 by 12 
Let's see how many times 12 fits into 213621.

Advancing to step 1:
If we divide 2 by 12, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 12

On to step 2:
12 goes into 21 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 12 from 21 leaves us with 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 12

Let's proceed to step 3:
12 can be fit into 93 7 times, resulting in a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 84 from 93, we get 9.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 12

Step 4:
The number 12 fits into 96 8 times, leaving a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 178.0
Subtracting 96 from 96 leaves us with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 12

On to step 5:
12 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 1780.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 12

Let's proceed to step 6:
12 goes into 21 1 times with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 17801.0
Subtracting 12 from 21 leaves us 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 7:
The number 12 fits into 90 7 times, leaving a remainder of 6.
The next digit of our result is 7. 
Result so far: 17801.7
If we subtract 84 from 90, 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.

Going ahead to step 8:
The number 12 fits into 60 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 17801.75
If we subtract 60 from 60, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
0 divided by 12 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 17801.75
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 10:
0 divided by 12 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 17801.75
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 17801.75 with a balance of 0.0.