21155018648

Names of 21155018648

• Cardinal: 21155018648 can be written as Twenty-one billion, one hundred fifty-five million, eighteen thousand, six hundred forty-eight.

Scientific notation

• Scientific notation: 2.1155018648 × 10¹⁰

Factors of 21155018648

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 1088

Divisors of 21155018648

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 4 8 73 146 269 292 311 433 538 584 622 866 1076 1244 1732 2152 2488 3464 19637 22703 31609 39274 45406 63218 78548 83659 90812 116477 126436 134663 157096 167318 181624 232954 252872 269326 334636 465908 538652 669272 931816 1077304 6107107 8502821 9830399 12214214 17005642 19660798 24428428 34011284 36224347 39321596 48856856 68022568 72448694 78643192 144897388 289794776 2644377331 5288754662 10577509324 21155018648
• Sum of all divisors σ(n): 40581777600
• Sum of proper divisors (its aliquot sum) s(n): 19426758952
• 21155018648 is a deficient number, because the sum of its proper divisors (19426758952) is less than itself. Its deficiency is 1728259696

Bases of 21155018648

• Binary: 10011101100111011111111011110011000₂
• Hexadecimal: 0x4ECEFF798
• Base-36: 9PV5GUW

Squares and roots of 21155018648

• 21155018648 squared (21155018648²) is 447534813997227747904
• 21155018648 cubed (21155018648³) is 9467607335740564427212162913792
• The square root of 21155018648 is 145447.6491662893
• The cube root of 21155018648 is 2765.6961862811

Scales and comparisons

• 21,155,018,648 seconds is equal to 672 years, 34 weeks, 3 days, 18 hours, 4 minutes, 8 seconds.
• To count from 1 to 21,155,018,648 would take you about one thousand, three hundred forty-five 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 21155018648 cubic inches would be around 230.5 feet tall.

Recreational maths with 21155018648

• 21155018648 backwards is 84681055112
• The number of decimal digits it has is: 11
• The sum of 21155018648's digits is 41
• More coming soon!