21005496821

Names of 21005496821

• Cardinal: 21005496821 can be written as Twenty-one billion, five million, four hundred ninety-six thousand, eight hundred twenty-one.

Scientific notation

• Scientific notation: 2.1005496821 × 10¹⁰

Factors of 21005496821

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 21005496821

Divisors of 21005496821

• Number of divisors d(n): 2
• Complete list of divisors:
  1 21005496821
• Sum of all divisors σ(n): 21005496822
• Sum of proper divisors (its aliquot sum) s(n): 1
• 21005496821 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 21005496820

Bases of 21005496821

• Binary: 10011100100000001100111000111110101₂
• Hexadecimal: 0x4E40671F5
• Base-36: 9NE4P2T

Squares and roots of 21005496821

• 21005496821 squared (21005496821²) is 441230896697041106041
• 21005496821 cubed (21005496821³) is 9268274197896676353050549395661
• The square root of 21005496821 is 144932.7320552541
• The cube root of 21005496821 is 2759.1648746249

Scales and comparisons

• 21,005,496,821 seconds is equal to 667 years, 47 weeks, 2 days, 4 hours, 13 minutes, 41 seconds.
• To count from 1 to 21,005,496,821 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 21005496821 cubic inches would be around 229.9 feet tall.

Recreational maths with 21005496821

• 21005496821 backwards is 12869450012
• The number of decimal digits it has is: 11
• The sum of 21005496821's digits is 38
• More coming soon!