We divide 664069 by 21
We want to figure out the number of times 664069 can be divided by 21.

Step 1:
6 divided by 21 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 21

Let's proceed to step 2:
21 can be fit into 66 3 times, resulting in a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 63 from 66 leaves us with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 21

Moving on to step 3:
When dividing 34 by 21, we get 1 with a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
If we take 21 away from 34, we end up with 13.
Grab the next digit (0) from the dividend, add it to 13, then carry on: 130 / 21

Advancing to step 4:
21 can be fit into 130 6 times, resulting in a remainder of 4.
The next digit of our result is 6. 
Result so far: 316.0
Subtract 126 from 130 to get 4.
Take the next digit (6) from the dividend and append it to 4, then repeat: 46 / 21

Step 5:
46 divided by 21 is 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 3162.0
Deduct 42 from 46 and we're left with 4.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 21

Step 6:
The number 21 fits into 49 2 times, leaving a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 31622.0
Subtracting 42 from 49 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
21 goes into 70 3 times with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 31622.3
If we take 63 away from 70, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 8:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 31622.33
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 31622.33 and a remainder of 0.007.