Q: Is 21,051,520 a Composite Number?

Why is 21,051,520 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 21,051,520 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 37 40 56 64 70 74 80 112 127 128 140 148 160 185 224 254 259 280 296 320 370 448 508 518 560 592 635 640 740 889 896 1,016 1,036 1,120 1,184 1,270 1,295 1,480 1,778 2,032 2,072 2,240 2,368 2,540 2,590 2,960 3,556 4,064 4,144 4,445 4,480 4,699 4,736 5,080 5,180 5,920 7,112 8,128 8,288 8,890 9,398 10,160 10,360 11,840 14,224 16,256 16,576 17,780 18,796 20,320 20,720 23,495 23,680 28,448 32,893 33,152 35,560 37,592 40,640 41,440 46,990 56,896 65,786 71,120 75,184 81,280 82,880 93,980 113,792 131,572 142,240 150,368 164,465 165,760 187,960 263,144 284,480 300,736 328,930 375,920 526,288 568,960 601,472 657,860 751,840 1,052,576 1,315,720 1,503,680 2,105,152 2,631,440 3,007,360 4,210,304 5,262,880 10,525,760 and 21,051,520, with no remainder.

Since 21,051,520 cannot be divided by just 1 and 21,051,520, 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).