21018389

Names of 21018389

• Cardinal: 21018389 can be written as Twenty-one million, eighteen thousand, three hundred eighty-nine.

Scientific notation

• Scientific notation: 2.1018389 × 10⁷

Factors of 21018389

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 6920

Divisors of 21018389

• Number of divisors d(n): 16
• Complete list of divisors:
  1 7 19 23 133 161 437 3059 6871 48097 130549 158033 913843 1106231 3002627 21018389
• Sum of all divisors σ(n): 26388480
• Sum of proper divisors (its aliquot sum) s(n): 5370091
• 21018389 is a deficient number, because the sum of its proper divisors (5370091) is less than itself. Its deficiency is 15648298

Bases of 21018389

• Binary: 1010000001011011100010101₂
• Hexadecimal: 0x140B715
• Base-36: CIHW5

Squares and roots of 21018389

• 21018389 squared (21018389²) is 441772676155321
• 21018389 cubed (21018389³) is 9285349957003561197869
• The square root of 21018389 is 4584.5816603045
• The cube root of 21018389 is 275.9729240749

Scales and comparisons

• 21,018,389 seconds is equal to 34 weeks, 5 days, 6 hours, 26 minutes, 29 seconds.
• To count from 1 to 21,018,389 would take you about twenty-one hours!

  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 21018389 cubic inches would be around 23 feet tall.

Recreational maths with 21018389

• 21018389 backwards is 98381012
• The number of decimal digits it has is: 8
• The sum of 21018389's digits is 32
• More coming soon!