21191

Names of 21191

• Cardinal: 21191 can be written as Twenty-one thousand, one hundred ninety-one.

Scientific notation

• Scientific notation: 2.1191 × 10⁴

Factors of 21191

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 21191

Divisors of 21191

• Number of divisors d(n): 2
• Complete list of divisors:
  1 21191
• Sum of all divisors σ(n): 21192
• Sum of proper divisors (its aliquot sum) s(n): 1
• 21191 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 21190

Bases of 21191

• Binary: 101001011000111₂
• Hexadecimal: 0x52C7
• Base-36: GCN

Squares and roots of 21191

• 21191 squared (21191²) is 449058481
• 21191 cubed (21191³) is 9515998270871
• The square root of 21191 is 145.5712883779
• The cube root of 21191 is 27.6726330257

Scales and comparisons

• 21,191 seconds is equal to 5 hours, 53 minutes, 11 seconds.
• To count from 1 to 21,191 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 21191 cubic inches would be around 2.3 feet tall.

Recreational maths with 21191

• 21191 backwards is 19112
• 21191 is a twin prime! Its twin is 21193
• The number of decimal digits it has is: 5
• The sum of 21191's digits is 14
• More coming soon!