Let's divide 571963 by 21
We want to figure out the number of times 571963 can be divided by 21.

Step 1:
When dividing 5 by 21, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 21

Let's proceed to step 2:
21 goes into 57 2 times with a remainder of 15.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 42 from 57 and we're left with 15.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 21

Going ahead to step 3:
The number 21 fits into 151 7 times, leaving a remainder of 4.
The next digit of our result is 7. 
Result so far: 27.0
If we take 147 away from 151, we end up with 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 21

Moving on to step 4:
49 divided by 21 is 2 with a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 272.0
If we subtract 42 from 49, we get 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 21

Advancing to step 5:
21 can be fit into 76 3 times, resulting in a remainder of 13.
The next digit of our result is 3. 
Result so far: 2723.0
The remainder is 13 after subtracting 63 from 76.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 21

Let's proceed to step 6:
133 divided by 21 is 6 with a remainder of 7.
The number 6 becomes the next digit in our result. 
Result so far: 27236.0
The remainder is 7 after subtracting 126 from 133.
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.
The number 3 becomes the next digit in our result. 
Result so far: 27236.3
If we subtract 63 from 70, we get 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:
21 goes into 70 3 times with a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 27236.33
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.

The quotient of the division is 27236.33, and the remainder is 0.007.