21381838

Names of 21381838

• Cardinal: 21381838 can be written as Twenty-one million, three hundred eighty-one thousand, eight hundred thirty-eight.

Scientific notation

• Scientific notation: 2.1381838 × 10⁷

Factors of 21381838

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 24578

Divisors of 21381838

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 443 886 24133 48266 10690919 21381838
• Sum of all divisors σ(n): 32146488
• Sum of proper divisors (its aliquot sum) s(n): 10764650
• 21381838 is a deficient number, because the sum of its proper divisors (10764650) is less than itself. Its deficiency is 10617188

Bases of 21381838

• Binary: 1010001100100001011001110₂
• Hexadecimal: 0x14642CE
• Base-36: CQABY

Squares and roots of 21381838

• 21381838 squared (21381838²) is 457182996258244
• 21381838 cubed (21381838³) is 9775412762348379372472
• The square root of 21381838 is 4624.0499564775
• The cube root of 21381838 is 277.5545459965

Scales and comparisons

• 21,381,838 seconds is equal to 35 weeks, 2 days, 11 hours, 23 minutes, 58 seconds.
• To count from 1 to 21,381,838 would take you about five 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 21381838 cubic inches would be around 23.1 feet tall.

Recreational maths with 21381838

• 21381838 backwards is 83818312
• The number of decimal digits it has is: 8
• The sum of 21381838's digits is 34
• More coming soon!