We're dividing 16289041 by 21 
Our goal is to divide 16289041 by 21.

Advancing to step 1:
21 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 21

Step 2:
When dividing 16 by 21, we get 0 with a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Take the next digit (2) from the dividend and append it to 16, then repeat: 162 / 21

Moving on to step 3:
21 can be fit into 162 7 times, resulting in a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Deduct 147 from 162 and we're left with 15.
Grab the next digit (8) from the dividend, add it to 15, then carry on: 158 / 21

On to step 4:
If we divide 158 by 21, we get 7 and a remainder of 11.
Put 7 as the next digit of the answer. 
Result so far: 77.0
Subtracting 147 from 158 leaves us with 11.
Grab the next digit (9) from the dividend, add it to 11, then carry on: 119 / 21

Step 5:
21 goes into 119 5 times with a remainder of 14.
Use 5 as the next digit of our solution. 
Result so far: 775.0
If we subtract 105 from 119, we get 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 21

Moving on to step 6:
21 goes into 140 6 times with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 7756.0
Subtracting 126 from 140 leaves us with 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 21

On to step 7:
If we divide 144 by 21, we get 6 and a remainder of 18.
Put 6 as the next digit of the answer. 
Result so far: 77566.0
If we subtract 126 from 144, we get 18.
Append the next digit (1) from the dividend to 18 and continue with: 181 / 21

Advancing to step 8:
When dividing 181 by 21, we get 8 with a remainder of 13.
Use 8 as the next digit of our solution. 
Result so far: 775668.0
If we subtract 168 from 181, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 9:
130 divided by 21 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 775668.6
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 10:
21 goes into 40 1 times with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 775668.61
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 11:
190 divided by 21 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 775668.619
Subtracting 189 from 190 leaves us 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.

Going ahead to step 12:
If we divide 10 by 21, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 775668.619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 13:
If we divide 100 by 21, we get 4 and a remainder of 16.
The next digit of our result is 4. 
Result so far: 775668.61904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 14:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 775668.619047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 15:
If we divide 130 by 21, we get 6 and a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 775668.6190476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 16:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 775668.61904761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final outcome is 775668.61904761, with a leftover of 1.9e-08.