21490

Names of 21490

• Cardinal: 21490 can be written as Twenty-one thousand, four hundred ninety.

Scientific notation

• Scientific notation: 2.149 × 10⁴

Factors of 21490

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 321

Divisors of 21490

• Number of divisors d(n): 16
• Complete list of divisors:
  1 2 5 7 10 14 35 70 307 614 1535 2149 3070 4298 10745 21490
• Sum of all divisors σ(n): 44352
• Sum of proper divisors (its aliquot sum) s(n): 22862
• 21490 is an abundant number, because the sum of its proper divisors (22862) is greater than itself. Its abundance is 1372

Bases of 21490

• Binary: 101001111110010₂
• Hexadecimal: 0x53F2
• Base-36: GKY

Squares and roots of 21490

• 21490 squared (21490²) is 461820100
• 21490 cubed (21490³) is 9924513949000
• The square root of 21490 is 146.5946793031
• The cube root of 21490 is 27.8021770805

Scales and comparisons

• 21,490 seconds is equal to 5 hours, 58 minutes, 10 seconds.
• To count from 1 to 21,490 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 21490 cubic inches would be around 2.3 feet tall.

Recreational maths with 21490

• 21490 backwards is 09412
• The number of decimal digits it has is: 5
• The sum of 21490's digits is 16
• More coming soon!