21147347655

Names of 21147347655

• Cardinal: 21147347655 can be written as Twenty-one billion, one hundred forty-seven million, three hundred forty-seven thousand, six hundred fifty-five.

Scientific notation

• Scientific notation: 2.1147347655 × 10¹⁰

Factors of 21147347655

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 472

Divisors of 21147347655

• Number of divisors d(n): 144
• Complete list of divisors:
  1 3 5 7 9 15 21 31 35 45 63 79 93 105 155 217 237 279 315 347 395 465 553 651 711 1041 1085 1185 1395 1659 1735 1953 2429 2449 2765 3123 3255 3555 4977 5205 6241 7287 7347 8295 9765 10757 12145 12245 15615 17143 18723 21861 22041 24885 27413 31205 32271 36435 36735 43687 51429 53785 56169 75299 82239 85715 93615 96813 109305 110205 131061 137065 154287 161355 191891 193471 218435 225897 246717 257145 280845 376495 393183 411195 484065 575673 580413 655305 677691 771435 849803 959455 967355 1129485 1233585 1354297 1727019 1741239 1965915 2165627 2549409 2878365 2902065 3388455 4062891 4249015 5948621 6496881 6771485 7648227 8635095 8706195 10828135 12188673 12747045 15159389 17845863 19490643 20314455 29743105 32484405 38241135 45478167 53537589 60943365 67134437 75796945 89229315 97453215 136434501 201403311 227390835 267687945 335672185 469941059 604209933 682172505 1007016555 1409823177 2349705295 3021049665 4229469531 7049115885 21147347655
• Sum of all divisors σ(n): 43923769344
• Sum of proper divisors (its aliquot sum) s(n): 22776421689
• 21147347655 is an abundant number, because the sum of its proper divisors (22776421689) is greater than itself. Its abundance is 1629074034

Bases of 21147347655

• Binary: 10011101100011110101110101011000111₂
• Hexadecimal: 0x4EC7AEAC7
• Base-36: 9PQL1VR

Squares and roots of 21147347655

• 21147347655 squared (21147347655²) is 447210312841433999025
• 21147347655 cubed (21147347655³) is 9457311960559115666118606036375
• The square root of 21147347655 is 145421.2764866269
• The cube root of 21147347655 is 2765.3618574033

Scales and comparisons

• 21,147,347,655 seconds is equal to 672 years, 21 weeks, 5 days, 23 hours, 14 minutes, 15 seconds.
• To count from 1 to 21,147,347,655 would take you about one thousand, three hundred forty-four 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 21147347655 cubic inches would be around 230.4 feet tall.

Recreational maths with 21147347655

• 21147347655 backwards is 55674374112
• 21147347655 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21147347655's digits is 45
• More coming soon!