421673 divided by 2 
We want to figure out the number of times 421673 can be divided by 2.

Step 1:
4 divided by 2 is 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 4 from 4, we get 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 2

Step 2:
2 can be fit into 2 1 times, resulting in a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 21.0
The remainder is 0 after subtracting 2 from 2.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 2

Moving on to step 3:
1 divided by 2 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 210.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 2

Going ahead to step 4:
When dividing 16 by 2, we get 8 with a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 2108.0
If we take 16 away from 16, we end up with 0.
Fetch the next digit (7) from the dividend, attach it to 0 and continue: 7 / 2

Advancing to step 5:
7 divided by 2 is 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 21083.0
Subtract 6 from 7 to get 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 2

Let's proceed to step 6:
2 goes into 13 6 times with a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 210836.0
Deduct 12 from 13 and we're left with 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 7:
2 goes into 10 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 210836.5
The remainder is 0 after subtracting 10 from 10.
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 8:
2 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 210836.5
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.

Moving on to step 9:
When dividing 0 by 2, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 210836.5
If we subtract 0 from 0, 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.

The quotient of the division is 210836.5, and the remainder is 0.0.