21455239872

Names of 21455239872

• Cardinal: 21455239872 can be written as Twenty-one billion, four hundred fifty-five million, two hundred thirty-nine thousand, eight hundred seventy-two.

Scientific notation

• Scientific notation: 2.1455239872 × 10¹⁰

Factors of 21455239872

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 47

Divisors of 21455239872

• Number of divisors d(n): 210
• Complete list of divisors:
  1 2 3 4 6 8 11 12 16 22 24 31 32 33 44 48 62 64 66 88 93 96 121 124 132 176 186 192 242 248 264 341 352 363 372 484 496 528 682 704 726 744 961 968 992 1023 1056 1364 1452 1488 1922 1936 1984 2046 2112 2728 2883 2904 2976 3751 3844 3872 4092 5456 5766 5808 5952 7502 7688 7744 8184 10571 10912 11253 11532 11616 15004 15376 16368 21142 21824 22506 23064 23232 29791 30008 30752 31713 32736 42284 45012 46128 59582 60016 61504 63426 65472 84568 89373 90024 92256 116281 119164 120032 126852 169136 178746 180048 184512 232562 238328 240064 253704 327701 338272 348843 357492 360096 465124 476656 507408 655402 676544 697686 714984 720192 923521 930248 953312 983103 1014816 1310804 1395372 1429968 1847042 1860496 1906624 1966206 2029632 2621608 2770563 2790744 2859936 3604711 3694084 3720992 3932412 5243216 5541126 5581488 5719872 7209422 7388168 7441984 7864824 10158731 10486432 10814133 11082252 11162976 14418844 14776336 15729648 20317462 20972864 21628266 22164504 22325952 28837688 29552672 30476193 31459296 40634924 43256532 44329008 57675376 59105344 60952386 62918592 81269848 86513064 88658016 111746041 115350752 121904772 162539696 173026128 177316032 223492082 230701504 243809544 325079392 335238123 346052256 446984164 487619088 650158784 670476246 692104512 893968328 975238176 1340952492 1787936656 1950476352 2681904984 3575873312 5363809968 7151746624 10727619936 21455239872
• Sum of all divisors σ(n): 64476663020
• Sum of proper divisors (its aliquot sum) s(n): 43021423148
• 21455239872 is an abundant number, because the sum of its proper divisors (43021423148) is greater than itself. Its abundance is 21566183276

Bases of 21455239872

• Binary: 10011111110110101001111101011000000₂
• Hexadecimal: 0x4FED4FAC0
• Base-36: 9UTW91C

Squares and roots of 21455239872

• 21455239872 squared (21455239872²) is 460327317965058576384
• 21455239872 cubed (21455239872³) is 9876433026574746670849554382848
• The square root of 21455239872 is 146476.0726944849
• The cube root of 21455239872 is 2778.7178961103

Scales and comparisons

• 21,455,239,872 seconds is equal to 682 years, 10 weeks, 6 days, 12 hours, 51 minutes, 12 seconds.
• To count from 1 to 21,455,239,872 would take you about one thousand, three hundred sixty-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 21455239872 cubic inches would be around 231.6 feet tall.

Recreational maths with 21455239872

• 21455239872 backwards is 27893255412
• 21455239872 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21455239872's digits is 48
• More coming soon!