21012281280

Names of 21012281280

• Cardinal: 21012281280 can be written as Twenty-one billion, twelve million, two hundred eighty-one thousand, two hundred eighty.

Scientific notation

• Scientific notation: 2.101228128 × 10¹⁰

Factors of 21012281280

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 810669

Divisors of 21012281280

• Number of divisors d(n): 140
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 64 72 80 81 90 96 108 120 135 144 160 162 180 192 216 240 270 288 320 324 360 405 432 480 540 576 648 720 810 864 960 1080 1296 1440 1620 1728 2160 2592 2880 3240 4320 5184 6480 8640 12960 25920 810659 1621318 2431977 3242636 4053295 4863954 6485272 7295931 8106590 9727908 12159885 12970544 14591862 16213180 19455816 21887793 24319770 25941088 29183724 32426360 36479655 38911632 43775586 48639540 51882176 58367448 64852720 65663379 72959310 77823264 87551172 97279080 109438965 116734896 129705440 131326758 145918620 155646528 175102344 194558160 218877930 233469792 259410880 262653516 291837240 328316895 350204688 389116320 437755860 466939584 525307032 583674480 656633790 700409376 778232640 875511720 1050614064 1167348960 1313267580 1400818752 1751023440 2101228128 2334697920 2626535160 3502046880 4202456256 5253070320 7004093760 10506140640 21012281280
• Sum of all divisors σ(n): 74744473320
• Sum of proper divisors (its aliquot sum) s(n): 53732192040
• 21012281280 is an abundant number, because the sum of its proper divisors (53732192040) is greater than itself. Its abundance is 32719910760

Bases of 21012281280

• Binary: 10011100100011011011111011111000000₂
• Hexadecimal: 0x4E46DF7C0
• Base-36: 9NI6400

Squares and roots of 21012281280

• 21012281280 squared (21012281280²) is 441515964589838438400
• 21012281280 cubed (21012281280³) is 9277257637572205097416753152000
• The square root of 21012281280 is 144956.1357100831
• The cube root of 21012281280 is 2759.4618988771

Scales and comparisons

• 21,012,281,280 seconds is equal to 668 years, 6 weeks, 3 days, 16 hours, 48 minutes.
• To count from 1 to 21,012,281,280 would take you about one thousand, three hundred thirty-six years!

  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 21012281280 cubic inches would be around 230 feet tall.

Recreational maths with 21012281280

• 21012281280 backwards is 08218221012
• 21012281280 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21012281280's digits is 27
• More coming soon!