21281491008

Names of 21281491008

• Cardinal: 21281491008 can be written as Twenty-one billion, two hundred eighty-one million, four hundred ninety-one thousand and eight.

Scientific notation

• Scientific notation: 2.1281491008 × 10¹⁰

Factors of 21281491008

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 36947038

Divisors of 21281491008

• Number of divisors d(n): 42
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 32 36 48 64 72 96 144 192 288 576 36947033 73894066 110841099 147788132 221682198 295576264 332523297 443364396 591152528 665046594 886728792 1182305056 1330093188 1773457584 2364610112 2660186376 3546915168 5320372752 7093830336 10640745504 21281491008
• Sum of all divisors σ(n): 60999553134
• Sum of proper divisors (its aliquot sum) s(n): 39718062126
• 21281491008 is an abundant number, because the sum of its proper divisors (39718062126) is greater than itself. Its abundance is 18436571118

Bases of 21281491008

• Binary: 10011110100011110011100100001000000₂
• Hexadecimal: 0x4F479C840
• Base-36: 9RYG7K0

Squares and roots of 21281491008

• 21281491008 squared (21281491008²) is 452901859523584856064
• 21281491008 cubed (21281491008³) is 9638426850957650278250990272512
• The square root of 21281491008 is 145881.7706500713
• The cube root of 21281491008 is 2771.1966838235

Scales and comparisons

• 21,281,491,008 seconds is equal to 676 years, 35 weeks, 4 days, 13 hours, 16 minutes, 48 seconds.
• To count from 1 to 21,281,491,008 would take you about one thousand, three hundred fifty-three 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 21281491008 cubic inches would be around 230.9 feet tall.

Recreational maths with 21281491008

• 21281491008 backwards is 80019418212
• 21281491008 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21281491008's digits is 36
• More coming soon!