21966

Names of 21966

• Cardinal: 21966 can be written as Twenty-one thousand, nine hundred sixty-six.

Scientific notation

• Scientific notation: 2.1966 × 10⁴

Factors of 21966

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 535

Divisors of 21966

• Number of divisors d(n): 16
• Complete list of divisors:
  1 2 3 6 7 14 21 42 523 1046 1569 3138 3661 7322 10983 21966
• Sum of all divisors σ(n): 50304
• Sum of proper divisors (its aliquot sum) s(n): 28338
• 21966 is an abundant number, because the sum of its proper divisors (28338) is greater than itself. Its abundance is 6372

Bases of 21966

• Binary: 101010111001110₂
• Hexadecimal: 0x55CE
• Base-36: GY6

Squares and roots of 21966

• 21966 squared (21966²) is 482505156
• 21966 cubed (21966³) is 10598708256696
• The square root of 21966 is 148.2093114483
• The cube root of 21966 is 28.0059511161

Scales and comparisons

• 21,966 seconds is equal to 6 hours, 6 minutes, 6 seconds.
• To count from 1 to 21,966 would take you about six 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 21966 cubic inches would be around 2.3 feet tall.

Recreational maths with 21966

• 21966 backwards is 66912
• The number of decimal digits it has is: 5
• The sum of 21966's digits is 24
• More coming soon!