Q: Is 21,240,009 a Prime Number?
A: No, 21,240,009 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 21240009 can be evenly divided by 1 3 7 9 21 27 41 63 123 189 287 369 861 1,107 2,583 2,741 7,749 8,223 19,187 24,669 57,561 74,007 112,381 172,683 337,143 518,049 786,667 1,011,429 2,360,001 3,034,287 7,080,003 and 21,240,009, with no remainder.
Since 21,240,009 cannot be divided by just 1 and 21,240,009, it is not a prime number.
| Number | 21,240,007 | 21,240,008 | 21,240,010 | 21,240,011 |
| Prime? | no | no | no | no |