21017021857

Names of 21017021857

• Cardinal: 21017021857 can be written as Twenty-one billion, seventeen million, twenty-one thousand, eight hundred fifty-seven.

Scientific notation

• Scientific notation: 2.1017021857 × 10¹⁰

Factors of 21017021857

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 578

Divisors of 21017021857

• Number of divisors d(n): 64
• Complete list of divisors:
  1 13 23 31 73 89 299 349 403 713 949 1157 1679 2047 2263 2759 4537 6497 8027 9269 10819 21827 25477 26611 29419 31061 35867 52049 63457 84461 104351 140647 149431 201407 248837 331201 403793 585971 676637 714403 789787 824941 962891 1942603 2267453 2618291 3234881 4632361 7617623 9287239 10267231 12517583 18165101 22146493 29476889 52151419 60220693 70291043 236146313 287904409 677968447 913783559 1616693989 21017021857
• Sum of all divisors σ(n): 25062912000
• Sum of proper divisors (its aliquot sum) s(n): 4045890143
• 21017021857 is a deficient number, because the sum of its proper divisors (4045890143) is less than itself. Its deficiency is 16971131714

Bases of 21017021857

• Binary: 10011100100101101100100110110100001₂
• Hexadecimal: 0x4E4B64DA1
• Base-36: 9NKZPUP

Squares and roots of 21017021857

• 21017021857 squared (21017021857²) is 441715207737615728449
• 21017021857 cubed (21017021857³) is 9283538175590765285879609709793
• The square root of 21017021857 is 144972.4865517591
• The cube root of 21017021857 is 2759.6694038403

Scales and comparisons

• 21,017,021,857 seconds is equal to 668 years, 14 weeks, 2 days, 13 hours, 37 minutes, 37 seconds.
• To count from 1 to 21,017,021,857 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 21017021857 cubic inches would be around 230 feet tall.

Recreational maths with 21017021857

• 21017021857 backwards is 75812071012
• The number of decimal digits it has is: 11
• The sum of 21017021857's digits is 34
• More coming soon!