623378 divided by 21 
Our goal is to divide 623378 by 21.

Advancing to step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 21

Step 2:
When dividing 62 by 21, we get 2 with a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 42 from 62 leaves us with 20.
Take the next digit (3) from the dividend and append it to 20, then repeat: 203 / 21

Moving on to step 3:
21 can be fit into 203 9 times, resulting in a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
The remainder is 14 after subtracting 189 from 203.
Take the next digit (3) from the dividend and append it to 14, then repeat: 143 / 21

Advancing to step 4:
If we divide 143 by 21, we get 6 and a remainder of 17.
The number 6 becomes the next digit in our result. 
Result so far: 296.0
If we take 126 away from 143, we end up with 17.
Fetch the next digit (7) from the dividend, attach it to 17 and continue: 177 / 21

Step 5:
21 can be fit into 177 8 times, resulting in a remainder of 9.
Use 8 as the next digit of our solution. 
Result so far: 2968.0
If we take 168 away from 177, we end up with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 21

Let's proceed to step 6:
21 can be fit into 98 4 times, resulting in a remainder of 14.
The next digit of our result is 4. 
Result so far: 29684.0
The remainder is 14 after subtracting 84 from 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
21 can be fit into 140 6 times, resulting in a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 29684.6
If we subtract 126 from 140, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
21 can be fit into 140 6 times, resulting in a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 29684.66
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

In conclusion, the division gives 29684.66 with a balance of 0.014.