12789121921

Names of 12789121921

• Cardinal: 12789121921 can be written as Twelve billion, seven hundred eighty-nine million, one hundred twenty-one thousand, nine hundred twenty-one.

Scientific notation

• Scientific notation: 1.2789121921 × 10¹⁰

Factors of 12789121921

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 113089

Divisors of 12789121921

• Number of divisors d(n): 3
• Complete list of divisors:
  1 113089 12789121921
• Sum of all divisors σ(n): 12789235011
• Sum of proper divisors (its aliquot sum) s(n): 113090
• 12789121921 is a deficient number, because the sum of its proper divisors (113090) is less than itself. Its deficiency is 12789008831

Bases of 12789121921

• Binary: 1011111010010010101000001110000001₂
• Hexadecimal: 0x2FA4A8381
• Base-36: 5VIB9MP

Squares and roots of 12789121921

• 12789121921 squared (12789121921²) is 163561639510202730241
• 12789121921 cubed (12789121921³) is 2091809749294633440479222712961
• 12789121921 is a perfect square number. Its square root is 113089
• The cube root of 12789121921 is 2338.5513424287

Scales and comparisons

• 12,789,121,921 seconds is equal to 406 years, 34 weeks, 5 hours, 52 minutes, 1 second.
• To count from 1 to 12,789,121,921 would take you about eight hundred thirteen 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 12789121921 cubic inches would be around 194.9 feet tall.

Recreational maths with 12789121921

• 12789121921 backwards is 12912198721
• The number of decimal digits it has is: 11
• The sum of 12789121921's digits is 43
• More coming soon!