680421 divided by 21 
We want to figure out the number of times 680421 can be divided by 21.

Going ahead to step 1:
6 divided by 21 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 21

Advancing to step 2:
If we divide 68 by 21, we get 3 and a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 63 from 68 and we're left with 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 21

Advancing to step 3:
If we divide 50 by 21, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
If we take 42 away from 50, we end up with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 21

Advancing to step 4:
The number 21 fits into 84 4 times, leaving a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 324.0
Subtract 84 from 84 to get 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 21

Let's proceed to step 5:
2 divided by 21 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 3240.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 21

On to step 6:
The number 21 fits into 21 1 times, leaving a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 32401.0
Subtracting 21 from 21 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.

Step 7:
0 divided by 21 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 32401.0
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.

Let's proceed to step 8:
21 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 32401.0
Subtract 0 from 0 to 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.

The final result is 32401.0 with a remainder of 0.0.