21001731478

Names of 21001731478

• Cardinal: 21001731478 can be written as Twenty-one billion, one million, seven hundred thirty-one thousand, four hundred seventy-eight.

Scientific notation

• Scientific notation: 2.1001731478 × 10¹⁰

Factors of 21001731478

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 585976

Divisors of 21001731478

• Number of divisors d(n): 32
• Complete list of divisors:
  1 2 7 13 14 26 91 182 197 394 1379 2561 2758 5122 17927 35854 585757 1171514 4100299 7614841 8200598 15229682 53303887 106607774 115394129 230788258 807758903 1500123677 1615517806 3000247354 10500865739 21001731478
• Sum of all divisors σ(n): 38969308224
• Sum of proper divisors (its aliquot sum) s(n): 17967576746
• 21001731478 is a deficient number, because the sum of its proper divisors (17967576746) is less than itself. Its deficiency is 3034154732

Bases of 21001731478

• Binary: 10011100011110011001111110110010110₂
• Hexadecimal: 0x4E3CCFD96
• Base-36: 9NBVZPY

Squares and roots of 21001731478

• 21001731478 squared (21001731478²) is 441072725074016064484
• 21001731478 cubed (21001731478³) is 9263290934274203061351300627352
• The square root of 21001731478 is 144919.7415054277
• The cube root of 21001731478 is 2758.9999999563

Scales and comparisons

• 21,001,731,478 seconds is equal to 667 years, 41 weeks, 14 hours, 17 minutes, 58 seconds.
• To count from 1 to 21,001,731,478 would take you about one thousand, three hundred thirty-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 21001731478 cubic inches would be around 229.9 feet tall.

Recreational maths with 21001731478

• 21001731478 backwards is 87413710012
• The number of decimal digits it has is: 11
• The sum of 21001731478's digits is 34
• More coming soon!