21237153 ÷ 651 
Let's see how many times 651 fits into 21237153.

Step 1:
If we divide 2 by 651, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 651

Let's proceed to step 2:
When dividing 21 by 651, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Take the next digit (2) from the dividend and append it to 21, then repeat: 212 / 651

Step 3:
The number 651 fits into 212 0 times, leaving a remainder of 212.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 212 to get 212.
Fetch the next digit (3) from the dividend, attach it to 212 and continue: 2123 / 651

Let's proceed to step 4:
When dividing 2123 by 651, we get 3 with a remainder of 170.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 1953 from 2123 to get 170.
Bring next digit (7) of the dividend behind the 170 and repeat the process: 1707 / 651

Moving on to step 5:
The number 651 fits into 1707 2 times, leaving a remainder of 405.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Deduct 1302 from 1707 and we're left with 405.
Take the next digit (1) from the dividend and append it to 405, then repeat: 4051 / 651

On to step 6:
If we divide 4051 by 651, we get 6 and a remainder of 145.
The number 6 becomes the next digit in our result. 
Result so far: 326.0
Subtract 3906 from 4051 to get 145.
Grab the next digit (5) from the dividend, add it to 145, then carry on: 1455 / 651

Step 7:
1455 divided by 651 is 2 with a remainder of 153.
Put 2 as the next digit of the answer. 
Result so far: 3262.0
If we take 1302 away from 1455, we end up with 153.
Take the next digit (3) from the dividend and append it to 153, then repeat: 1533 / 651

Step 8:
1533 divided by 651 is 2 with a remainder of 231.
Record the quotient 2 as the next digit in the result. 
Result so far: 32622.0
Deduct 1302 from 1533 and we're left with 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Moving on to step 9:
651 can be fit into 2310 3 times, resulting in a remainder of 357.
The next digit of our result is 3. 
Result so far: 32622.3
Subtracting 1953 from 2310 leaves us with 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Step 10:
When dividing 3570 by 651, we get 5 with a remainder of 315.
The number 5 becomes the next digit in our result. 
Result so far: 32622.35
The remainder is 315 after subtracting 3255 from 3570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Moving on to step 11:
When dividing 3150 by 651, we get 4 with a remainder of 546.
Put 4 as the next digit of the answer. 
Result so far: 32622.354
Subtract 2604 from 3150 to get 546.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Advancing to step 12:
If we divide 5460 by 651, we get 8 and a remainder of 252.
Write down 8 as next digit of the result. 
Result so far: 32622.3548
If we subtract 5208 from 5460, we get 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Let's proceed to step 13:
651 can be fit into 2520 3 times, resulting in a remainder of 567.
The next digit of our result is 3. 
Result so far: 32622.35483
Subtract 1953 from 2520 to get 567.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5670, and continue the process.

Step 14:
651 goes into 5670 8 times with a remainder of 462.
Write down 8 as next digit of the result. 
Result so far: 32622.354838
If we subtract 5208 from 5670, we get 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Let's proceed to step 15:
651 can be fit into 4620 7 times, resulting in a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 32622.3548387
Subtracting 4557 from 4620 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 16:
651 goes into 630 0 times with a remainder of 630.
Put 0 as the next digit of the answer. 
Result so far: 32622.3548387
Deduct 0 from 630 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

The final result is 32622.3548387 with a remainder of 6.3e-07.