21006

Names of 21006

• Cardinal: 21006 can be written as Twenty-one thousand and six.

Scientific notation

• Scientific notation: 2.1006 × 10⁴

Factors of 21006

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 394

Divisors of 21006

• Number of divisors d(n): 16
• Complete list of divisors:
  1 2 3 6 9 18 27 54 389 778 1167 2334 3501 7002 10503 21006
• Sum of all divisors σ(n): 46800
• Sum of proper divisors (its aliquot sum) s(n): 25794
• 21006 is an abundant number, because the sum of its proper divisors (25794) is greater than itself. Its abundance is 4788

Bases of 21006

• Binary: 101001000001110₂
• Hexadecimal: 0x520E
• Base-36: G7I

Squares and roots of 21006

• 21006 squared (21006²) is 441252036
• 21006 cubed (21006³) is 9268940268216
• The square root of 21006 is 144.9344679501
• The cube root of 21006 is 27.5918690605

Scales and comparisons

• 21,006 seconds is equal to 5 hours, 50 minutes, 6 seconds.
• To count from 1 to 21,006 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 21006 cubic inches would be around 2.3 feet tall.

Recreational maths with 21006

• 21006 backwards is 60012
• 21006 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 21006's digits is 9
• More coming soon!