We're dividing 21045745 by 2 
Our goal is to divide 21045745 by 2.

Moving on to step 1:
If we divide 2 by 2, we get 1 and a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 2 away from 2, we end up with 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 2

Let's proceed to step 2:
2 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 10.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 2

Going ahead to step 3:
10 divided by 2 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 105.0
If we take 10 away from 10, we end up with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 2

On to step 4:
2 goes into 4 2 times with a remainder of 0.
The next digit of our result is 2. 
Result so far: 1052.0
Subtracting 4 from 4 leaves us with 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 2

Advancing to step 5:
5 divided by 2 is 2 with a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 10522.0
Deduct 4 from 5 and we're left with 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 2

Advancing to step 6:
When dividing 17 by 2, we get 8 with a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 105228.0
Deduct 16 from 17 and we're left with 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 2

Step 7:
If we divide 14 by 2, we get 7 and a remainder of 0.
The next digit of our result is 7. 
Result so far: 1052287.0
If we take 14 away from 14, we end up with 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 2

Let's proceed to step 8:
If we divide 5 by 2, we get 2 and a remainder of 1.
The next digit of our result is 2. 
Result so far: 10522872.0
If we subtract 4 from 5, 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.

Let's proceed to step 9:
If we divide 10 by 2, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 10522872.5
Deduct 10 from 10 and we're left 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 10:
2 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10522872.5
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 11:
0 divided by 2 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10522872.5
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 result is 10522872.5 with a remainder of 0.0.