Let's divide 409721 by 2
We want to figure out the number of times 409721 can be divided by 2.

Let's proceed to step 1:
When dividing 4 by 2, we get 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
If we take 4 away from 4, we end up with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 2

Moving on to step 2:
The number 2 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Deduct 0 from 0 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 2

Step 3:
The number 2 fits into 9 4 times, leaving a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 204.0
If we subtract 8 from 9, we get 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 2

Step 4:
17 divided by 2 is 8 with a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 2048.0
Deduct 16 from 17 and we're left with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 2

Moving on to step 5:
The number 2 fits into 12 6 times, leaving a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 20486.0
Subtracting 12 from 12 leaves us with 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 2

On to step 6:
2 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 204860.0
If we subtract 0 from 1, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
2 can be fit into 10 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 204860.5
Subtract 10 from 10 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.

Advancing to step 8:
The number 2 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 204860.5
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.

Advancing to step 9:
0 divided by 2 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 204860.5
The remainder is 0 after subtracting 0 from 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 outcome is 204860.5, with a leftover of 0.0.