21997

Names of 21997

• Cardinal: 21997 can be written as Twenty-one thousand, nine hundred ninety-seven.

Scientific notation

• Scientific notation: 2.1997 × 10⁴

Factors of 21997

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 21997

Divisors of 21997

• Number of divisors d(n): 2
• Complete list of divisors:
  1 21997
• Sum of all divisors σ(n): 21998
• Sum of proper divisors (its aliquot sum) s(n): 1
• 21997 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 21996

Bases of 21997

• Binary: 101010111101101₂
• Hexadecimal: 0x55ED
• Base-36: GZ1

Squares and roots of 21997

• 21997 squared (21997²) is 483868009
• 21997 cubed (21997³) is 10643644593973
• The square root of 21997 is 148.3138563991
• The cube root of 21997 is 28.0191195943

Scales and comparisons

• 21,997 seconds is equal to 6 hours, 6 minutes, 37 seconds.
• To count from 1 to 21,997 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 21997 cubic inches would be around 2.3 feet tall.

Recreational maths with 21997

• 21997 backwards is 79912
• The number of decimal digits it has is: 5
• The sum of 21997's digits is 28
• More coming soon!