We're dividing 21458407 by 951 
We want to figure out the number of times 21458407 can be divided by 951.

Moving on to step 1:
When dividing 2 by 951, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 951

Advancing to step 2:
If we divide 21 by 951, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Take the next digit (4) from the dividend and append it to 21, then repeat: 214 / 951

Advancing to step 3:
214 divided by 951 is 0 with a remainder of 214.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 214 leaves us with 214.
Take the next digit (5) from the dividend and append it to 214, then repeat: 2145 / 951

On to step 4:
The number 951 fits into 2145 2 times, leaving a remainder of 243.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 1902 from 2145 and we're left with 243.
Take the next digit (8) from the dividend and append it to 243, then repeat: 2438 / 951

Advancing to step 5:
When dividing 2438 by 951, we get 2 with a remainder of 536.
Write down 2 as next digit of the result. 
Result so far: 22.0
Deduct 1902 from 2438 and we're left with 536.
Bring next digit (4) of the dividend behind the 536 and repeat the process: 5364 / 951

Going ahead to step 6:
951 goes into 5364 5 times with a remainder of 609.
Write down 5 as next digit of the result. 
Result so far: 225.0
The remainder is 609 after subtracting 4755 from 5364.
Include the next digit (0) from the dividend after 609, then repeat: 6090 / 951

On to step 7:
The number 951 fits into 6090 6 times, leaving a remainder of 384.
The number 6 becomes the next digit in our result. 
Result so far: 2256.0
Deduct 5706 from 6090 and we're left with 384.
Include the next digit (7) from the dividend after 384, then repeat: 3847 / 951

Step 8:
When dividing 3847 by 951, we get 4 with a remainder of 43.
Write down 4 as next digit of the result. 
Result so far: 22564.0
Subtract 3804 from 3847 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 9:
If we divide 430 by 951, we get 0 and a remainder of 430.
Record the quotient 0 as the next digit in the result. 
Result so far: 22564.0
If we subtract 0 from 430, we get 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Let's proceed to step 10:
When dividing 4300 by 951, we get 4 with a remainder of 496.
Put 4 as the next digit of the answer. 
Result so far: 22564.04
Deduct 3804 from 4300 and we're left with 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Step 11:
951 goes into 4960 5 times with a remainder of 205.
Write down 5 as next digit of the result. 
Result so far: 22564.045
The remainder is 205 after subtracting 4755 from 4960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Moving on to step 12:
The number 951 fits into 2050 2 times, leaving a remainder of 148.
Write down 2 as next digit of the result. 
Result so far: 22564.0452
The remainder is 148 after subtracting 1902 from 2050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Moving on to step 13:
If we divide 1480 by 951, we get 1 and a remainder of 529.
The number 1 becomes the next digit in our result. 
Result so far: 22564.04521
If we subtract 951 from 1480, we get 529.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5290, and continue the process.

Moving on to step 14:
5290 divided by 951 is 5 with a remainder of 535.
Record the quotient 5 as the next digit in the result. 
Result so far: 22564.045215
Deduct 4755 from 5290 and we're left with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Going ahead to step 15:
If we divide 5350 by 951, we get 5 and a remainder of 595.
The number 5 becomes the next digit in our result. 
Result so far: 22564.0452155
Subtracting 4755 from 5350 leaves us with 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

The final outcome is 22564.0452155, with a leftover of 5.95e-06.