Q: Is 21,521,520 a Composite Number?

Why is 21,521,520 a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 21,521,520 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 36 40 45 48 60 71 72 80 90 120 142 144 180 213 240 284 355 360 421 426 568 639 710 720 842 852 1,065 1,136 1,263 1,278 1,420 1,684 1,704 2,105 2,130 2,526 2,556 2,840 3,195 3,368 3,408 3,789 4,210 4,260 5,052 5,112 5,680 6,315 6,390 6,736 7,578 8,420 8,520 10,104 10,224 12,630 12,780 15,156 16,840 17,040 18,945 20,208 25,260 25,560 29,891 30,312 33,680 37,890 50,520 51,120 59,782 60,624 75,780 89,673 101,040 119,564 149,455 151,560 179,346 239,128 269,019 298,910 303,120 358,692 448,365 478,256 538,038 597,820 717,384 896,730 1,076,076 1,195,640 1,345,095 1,434,768 1,793,460 2,152,152 2,391,280 2,690,190 3,586,920 4,304,304 5,380,380 7,173,840 10,760,760 and 21,521,520, with no remainder.

Since 21,521,520 cannot be divided by just 1 and 21,521,520, it is a composite number.

More Examples

• All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).