We divide 51014485 by 21
We want to figure out the number of times 51014485 can be divided by 21.

Moving on to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 21

Moving on to step 2:
21 can be fit into 51 2 times, resulting in a remainder of 9.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 42 from 51, we get 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 21

Moving on to step 3:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
If we subtract 84 from 90, we get 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 21

Step 4:
21 goes into 61 2 times with a remainder of 19.
The next digit of our result is 2. 
Result so far: 242.0
If we take 42 away from 61, we end up with 19.
Bring next digit (4) of the dividend behind the 19 and repeat the process: 194 / 21

On to step 5:
The number 21 fits into 194 9 times, leaving a remainder of 5.
The next digit of our result is 9. 
Result so far: 2429.0
The remainder is 5 after subtracting 189 from 194.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 21

Step 6:
21 goes into 54 2 times with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 24292.0
If we take 42 away from 54, we end up with 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 21

Advancing to step 7:
The number 21 fits into 128 6 times, leaving a remainder of 2.
The next digit of our result is 6. 
Result so far: 242926.0
Subtract 126 from 128 to get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 21

On to step 8:
If we divide 25 by 21, we get 1 and a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 2429261.0
The remainder is 4 after subtracting 21 from 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
The number 21 fits into 40 1 times, leaving a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 2429261.1
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 10:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 2429261.19
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.

Advancing to step 11:
The number 21 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 2429261.19
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 12:
When dividing 100 by 21, we get 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 2429261.1904
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.

Moving on to step 13:
160 divided by 21 is 7 with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 2429261.19047
Subtracting 147 from 160 leaves us 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.

Step 14:
130 divided by 21 is 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 2429261.190476
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 15:
40 divided by 21 is 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 2429261.1904761
Subtract 21 from 40 to 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 16:
If we divide 190 by 21, we get 9 and a remainder of 1.
The next digit of our result is 9. 
Result so far: 2429261.19047619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 2429261.19047619 and a remainder of 1e-09.