21020423821

Names of 21020423821

• Cardinal: 21020423821 can be written as Twenty-one billion, twenty million, four hundred twenty-three thousand, eight hundred twenty-one.

Scientific notation

• Scientific notation: 2.1020423821 × 10¹⁰

Factors of 21020423821

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 41790610

Divisors of 21020423821

• Number of divisors d(n): 4
• Complete list of divisors:
  1 503 41790107 21020423821
• Sum of all divisors σ(n): 21062214432
• Sum of proper divisors (its aliquot sum) s(n): 41790611
• 21020423821 is a deficient number, because the sum of its proper divisors (41790611) is less than itself. Its deficiency is 20978633210

Bases of 21020423821

• Binary: 10011100100111010100011011010001101₂
• Hexadecimal: 0x4E4EA368D
• Base-36: 9NN0MTP

Squares and roots of 21020423821

• 21020423821 squared (21020423821²) is 441858217614464240041
• 21020423821 cubed (21020423821³) is 9288047003047685905510498416661
• The square root of 21020423821 is 144984.2192136785
• The cube root of 21020423821 is 2759.8182956849

Scales and comparisons

• 21,020,423,821 seconds is equal to 668 years, 19 weeks, 6 days, 22 hours, 37 minutes, 1 second.
• To count from 1 to 21,020,423,821 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 21020423821 cubic inches would be around 230 feet tall.

Recreational maths with 21020423821

• 21020423821 backwards is 12832402012
• The number of decimal digits it has is: 11
• The sum of 21020423821's digits is 25
• More coming soon!