21285352920

Names of 21285352920

• Cardinal: 21285352920 can be written as Twenty-one billion, two hundred eighty-five million, three hundred fifty-two thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 2.128535292 × 10¹⁰

Factors of 21285352920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 13644480

Divisors of 21285352920

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 13 15 20 24 26 30 39 40 52 60 65 78 104 120 130 156 195 260 312 390 520 780 1560 13644457 27288914 40933371 54577828 68222285 81866742 109155656 136444570 163733484 177377941 204666855 272889140 327466968 354755882 409333710 532133823 545778280 709511764 818667420 886889705 1064267646 1419023528 1637334840 1773779410 2128535292 2660669115 3547558820 4257070584 5321338230 7095117640 10642676460 21285352920
• Sum of all divisors σ(n): 68768068320
• Sum of proper divisors (its aliquot sum) s(n): 47482715400
• 21285352920 is an abundant number, because the sum of its proper divisors (47482715400) is greater than itself. Its abundance is 26197362480

Bases of 21285352920

• Binary: 10011110100101101001011010111011000₂
• Hexadecimal: 0x4F4B4B5D8
• Base-36: 9S0QZFC

Squares and roots of 21285352920

• 21285352920 squared (21285352920²) is 453066248928952526400
• 21285352920 cubed (21285352920³) is 9643675004593326530349617088000
• The square root of 21285352920 is 145895.0064943965
• The cube root of 21285352920 is 2771.3643016287

Scales and comparisons

• 21,285,352,920 seconds is equal to 676 years, 42 weeks, 6 hours, 2 minutes.
• To count from 1 to 21,285,352,920 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 21285352920 cubic inches would be around 230.9 feet tall.

Recreational maths with 21285352920

• 21285352920 backwards is 02925358212
• 21285352920 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21285352920's digits is 39
• More coming soon!