21687738849

Names of 21687738849

• Cardinal: 21687738849 can be written as Twenty-one billion, six hundred eighty-seven million, seven hundred thirty-eight thousand, eight hundred forty-nine.

Scientific notation

• Scientific notation: 2.1687738849 × 10¹⁰

Factors of 21687738849

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 50821

Divisors of 21687738849

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 7 9 21 27 31 63 73 93 189 217 219 279 511 651 657 837 1533 1953 1971 2263 4599 5859 6789 13797 15841 20367 47523 50707 61101 142569 152121 354949 427707 456363 1064847 1369089 1571917 3194541 3701611 4715751 9583623 11003419 11104833 14147253 25911277 33010257 33314499 42441759 77733831 99030771 99943497 114749941 233201493 297092313 344249823 699604479 803249587 1032749469 2409748761 3098248407 7229246283 21687738849
• Sum of all divisors σ(n): 38424494080
• Sum of proper divisors (its aliquot sum) s(n): 16736755231
• 21687738849 is a deficient number, because the sum of its proper divisors (16736755231) is less than itself. Its deficiency is 4950983618

Bases of 21687738849

• Binary: 10100001100101100001010000111100001₂
• Hexadecimal: 0x50CB0A1E1
• Base-36: 9YOBIE9

Squares and roots of 21687738849

• 21687738849 squared (21687738849²) is 470358016382423844801
• 21687738849 cubed (21687738849³) is 10201001824835672059674594374049
• The square root of 21687738849 is 147267.5756879293
• The cube root of 21687738849 is 2788.7190176829

Scales and comparisons

• 21,687,738,849 seconds is equal to 689 years, 31 weeks, 2 days, 11 hours, 54 minutes, 9 seconds.
• To count from 1 to 21,687,738,849 would take you about one thousand, three hundred seventy-nine 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 21687738849 cubic inches would be around 232.4 feet tall.

Recreational maths with 21687738849

• 21687738849 backwards is 94883778612
• 21687738849 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21687738849's digits is 63
• More coming soon!