419544 divided by 21 
We want to figure out the number of times 419544 can be divided by 21.

Going ahead to step 1:
21 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 21

Step 2:
The number 21 fits into 41 1 times, leaving a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 20 after subtracting 21 from 41.
Fetch the next digit (9) from the dividend, attach it to 20 and continue: 209 / 21

Moving on to step 3:
21 can be fit into 209 9 times, resulting in a remainder of 20.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Deduct 189 from 209 and we're left with 20.
Take the next digit (5) from the dividend and append it to 20, then repeat: 205 / 21

Advancing to step 4:
21 can be fit into 205 9 times, resulting in a remainder of 16.
Record the quotient 9 as the next digit in the result. 
Result so far: 199.0
Deduct 189 from 205 and we're left with 16.
Take the next digit (4) from the dividend and append it to 16, then repeat: 164 / 21

Step 5:
When dividing 164 by 21, we get 7 with a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 1997.0
Subtract 147 from 164 to get 17.
Fetch the next digit (4) from the dividend, attach it to 17 and continue: 174 / 21

Moving on to step 6:
If we divide 174 by 21, we get 8 and a remainder of 6.
The next digit of our result is 8. 
Result so far: 19978.0
Subtracting 168 from 174 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 7:
60 divided by 21 is 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 19978.2
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 8:
21 goes into 180 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 19978.28
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 9:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 19978.285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 10:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 19978.2857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 11:
If we divide 30 by 21, we get 1 and a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 19978.28571
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 12:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 19978.285714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 13:
When dividing 60 by 21, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 19978.2857142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 14:
When dividing 180 by 21, we get 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 19978.28571428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

In conclusion, the division gives 19978.28571428 with a balance of 1.2e-08.