A:
Positive:
1 x 214132455 x 42826497 x 305903535 x 61180749 x 43700571 x 301595245 x 87401355 x 60319497 x 430851231 x 173952485 x 86173479 x 6155
Negative:
-1 x -21413245-5 x -4282649-7 x -3059035-35 x -611807-49 x -437005-71 x -301595-245 x -87401-355 x -60319-497 x -43085-1231 x -17395-2485 x -8617-3479 x -6155
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 21,413,245, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 21,413,245 | |
| -1 | -21,413,245 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,413,245.
Example:
1 x 21,413,245 = 21,413,245
and
-1 x -21,413,245 = 21,413,245
Notice both answers equal 21,413,245
With that explanation out of the way, let's continue. Next, we take the number 21,413,245 and divide it by 2:
21,413,245 ÷ 2 = 10,706,622.5
If the quotient is a whole number, then 2 and 10,706,622.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,413,245 | |
| -1 | -21,413,245 |
Now, we try dividing 21,413,245 by 3:
21,413,245 ÷ 3 = 7,137,748.3333
If the quotient is a whole number, then 3 and 7,137,748.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,413,245 | |
| -1 | -21,413,245 |
Let's try dividing by 4:
21,413,245 ÷ 4 = 5,353,311.25
If the quotient is a whole number, then 4 and 5,353,311.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,413,245 | |
| -1 | 21,413,245 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 71 | 245 | 355 | 497 | 1,231 | 2,485 | 3,479 | 6,155 | 8,617 | 17,395 | 43,085 | 60,319 | 87,401 | 301,595 | 437,005 | 611,807 | 3,059,035 | 4,282,649 | 21,413,245 |
| -1 | -5 | -7 | -35 | -49 | -71 | -245 | -355 | -497 | -1,231 | -2,485 | -3,479 | -6,155 | -8,617 | -17,395 | -43,085 | -60,319 | -87,401 | -301,595 | -437,005 | -611,807 | -3,059,035 | -4,282,649 | -21,413,245 |
Here are some more numbers to try:
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