A:
Positive:
1 x 2140123711 x 194556713 x 1646249103 x 207779143 x 1496591133 x 188891339 x 159831453 x 14729
Negative:
-1 x -21401237-11 x -1945567-13 x -1646249-103 x -207779-143 x -149659-1133 x -18889-1339 x -15983-1453 x -14729
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 21,401,237, 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 | 21,401,237 | |
| -1 | -21,401,237 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,401,237.
Example:
1 x 21,401,237 = 21,401,237
and
-1 x -21,401,237 = 21,401,237
Notice both answers equal 21,401,237
With that explanation out of the way, let's continue. Next, we take the number 21,401,237 and divide it by 2:
21,401,237 ÷ 2 = 10,700,618.5
If the quotient is a whole number, then 2 and 10,700,618.5 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 | 21,401,237 | |
| -1 | -21,401,237 |
Now, we try dividing 21,401,237 by 3:
21,401,237 ÷ 3 = 7,133,745.6667
If the quotient is a whole number, then 3 and 7,133,745.6667 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 | 21,401,237 | |
| -1 | -21,401,237 |
Let's try dividing by 4:
21,401,237 ÷ 4 = 5,350,309.25
If the quotient is a whole number, then 4 and 5,350,309.25 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 | 21,401,237 | |
| -1 | 21,401,237 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 103 | 143 | 1,133 | 1,339 | 1,453 | 14,729 | 15,983 | 18,889 | 149,659 | 207,779 | 1,646,249 | 1,945,567 | 21,401,237 |
| -1 | -11 | -13 | -103 | -143 | -1,133 | -1,339 | -1,453 | -14,729 | -15,983 | -18,889 | -149,659 | -207,779 | -1,646,249 | -1,945,567 | -21,401,237 |
Here are some more numbers to try:
Try the factor calculator