21081315840

Names of 21081315840

• Cardinal: 21081315840 can be written as Twenty-one billion, eighty-one million, three hundred fifteen thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.108131584 × 10¹⁰

Factors of 21081315840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 211174

Divisors of 21081315840

• Number of divisors d(n): 160
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 13 15 16 20 24 26 30 32 39 40 48 52 60 64 65 78 80 96 104 120 128 130 156 160 192 195 208 240 256 260 312 320 384 390 416 480 512 520 624 640 768 780 832 960 1040 1248 1280 1536 1560 1664 1920 2080 2496 2560 3120 3328 3840 4160 4992 6240 6656 7680 8320 9984 12480 16640 19968 24960 33280 49920 99840 211151 422302 633453 844604 1055755 1266906 1689208 2111510 2533812 2744963 3167265 3378416 4223020 5067624 5489926 6334530 6756832 8234889 8446040 10135248 10979852 12669060 13513664 13724815 16469778 16892080 20270496 21959704 25338120 27027328 27449630 32939556 33784160 40540992 41174445 43919408 50676240 54054656 54899260 65879112 67568320 81081984 82348890 87838816 101352480 108109312 109798520 131758224 135136640 162163968 164697780 175677632 202704960 219597040 263516448 270273280 324327936 329395560 351355264 405409920 439194080 527032896 540546560 658791120 702710528 810819840 878388160 1054065792 1317582240 1405421056 1621639680 1756776320 2108131584 2635164480 3513552640 4216263168 5270328960 7027105280 10540657920 21081315840
• Sum of all divisors σ(n): 72578854656
• Sum of proper divisors (its aliquot sum) s(n): 51497538816
• 21081315840 is an abundant number, because the sum of its proper divisors (51497538816) is greater than itself. Its abundance is 30416222976

Bases of 21081315840

• Binary: 10011101000100010110101101000000000₂
• Hexadecimal: 0x4E88B5A00
• Base-36: 9ON9REO

Squares and roots of 21081315840

• 21081315840 squared (21081315840²) is 444421877545834905600
• 21081315840 cubed (21081315840³) is 9368997966749549721450184704000
• The square root of 21081315840 is 145194.0626885273
• The cube root of 21081315840 is 2762.4806095703

Scales and comparisons

• 21,081,315,840 seconds is equal to 670 years, 16 weeks, 4 days, 17 hours, 4 minutes.
• To count from 1 to 21,081,315,840 would take you about one thousand, three hundred forty 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 21081315840 cubic inches would be around 230.2 feet tall.

Recreational maths with 21081315840

• 21081315840 backwards is 04851318012
• The number of decimal digits it has is: 11
• The sum of 21081315840's digits is 33
• More coming soon!