21991320

Names of 21991320

• Cardinal: 21991320 can be written as Twenty-one million, nine hundred ninety-one thousand, three hundred twenty.

Scientific notation

• Scientific notation: 2.199132 × 10⁷

Factors of 21991320

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 187

Divisors of 21991320

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 30 36 37 39 40 45 52 60 65 72 74 78 90 104 111 117 120 127 130 148 156 180 185 195 222 234 254 260 296 312 333 360 370 381 390 444 468 481 508 520 555 585 635 666 740 762 780 888 936 962 1016 1110 1143 1170 1270 1332 1443 1480 1524 1560 1651 1665 1905 1924 2220 2286 2340 2405 2540 2664 2886 3048 3302 3330 3810 3848 4329 4440 4572 4680 4699 4810 4953 5080 5715 5772 6604 6660 7215 7620 8255 8658 9144 9398 9620 9906 11430 11544 13208 13320 14097 14430 14859 15240 16510 17316 18796 19240 19812 21645 22860 23495 24765 28194 28860 29718 33020 34632 37592 39624 42291 43290 45720 46990 49530 56388 57720 59436 61087 66040 70485 74295 84582 86580 93980 99060 112776 118872 122174 140970 148590 169164 173160 183261 187960 198120 211455 244348 281940 297180 305435 338328 366522 422910 488696 549783 563880 594360 610870 733044 845820 916305 1099566 1221740 1466088 1691640 1832610 2199132 2443480 2748915 3665220 4398264 5497830 7330440 10995660 21991320
• Sum of all divisors σ(n): 79672320
• Sum of proper divisors (its aliquot sum) s(n): 57681000
• 21991320 is an abundant number, because the sum of its proper divisors (57681000) is greater than itself. Its abundance is 35689680

Bases of 21991320

• Binary: 1010011111000111110011000₂
• Hexadecimal: 0x14F8F98
• Base-36: D3CM0

Squares and roots of 21991320

• 21991320 squared (21991320²) is 483618155342400
• 21991320 cubed (21991320³) is 10635401611944427968000
• The square root of 21991320 is 4689.4903774291
• The cube root of 21991320 is 280.1670771553

Scales and comparisons

• 21,991,320 seconds is equal to 36 weeks, 2 days, 12 hours, 42 minutes.
• To count from 1 to 21,991,320 would take you about two weeks!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 21991320 cubic inches would be around 23.3 feet tall.

Recreational maths with 21991320

• 21991320 backwards is 02319912
• The number of decimal digits it has is: 8
• The sum of 21991320's digits is 27
• More coming soon!