21357930

Names of 21357930

• Cardinal: 21357930 can be written as Twenty-one million, three hundred fifty-seven thousand, nine hundred thirty.

Scientific notation

• Scientific notation: 2.135793 × 10⁷

Factors of 21357930

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 1143

Divisors of 21357930

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 5 6 10 11 15 22 30 33 55 61 66 110 122 165 183 305 330 366 610 671 915 1061 1342 1830 2013 2122 3183 3355 4026 5305 6366 6710 10065 10610 11671 15915 20130 23342 31830 35013 58355 64721 70026 116710 129442 175065 194163 323605 350130 388326 647210 711931 970815 1423862 1941630 2135793 3559655 4271586 7119310 10678965 21357930
• Sum of all divisors σ(n): 56889216
• Sum of proper divisors (its aliquot sum) s(n): 35531286
• 21357930 is an abundant number, because the sum of its proper divisors (35531286) is greater than itself. Its abundance is 14173356

Bases of 21357930

• Binary: 1010001011110010101101010₂
• Hexadecimal: 0x145E56A
• Base-36: CPRVU

Squares and roots of 21357930

• 21357930 squared (21357930²) is 456161173884900
• 21357930 cubed (21357930³) is 9742658420551522257000
• The square root of 21357930 is 4621.4640537387
• The cube root of 21357930 is 277.4510586525

Scales and comparisons

• 21,357,930 seconds is equal to 35 weeks, 2 days, 4 hours, 45 minutes, 30 seconds.
• To count from 1 to 21,357,930 would take you about six days!

  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 21357930 cubic inches would be around 23.1 feet tall.

Recreational maths with 21357930

• 21357930 backwards is 03975312
• 21357930 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21357930's digits is 30
• More coming soon!