21028

Names of 21028

• Cardinal: 21028 can be written as Twenty-one thousand and twenty-eight.

Scientific notation

• Scientific notation: 2.1028 × 10⁴

Factors of 21028

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 760

Divisors of 21028

• Number of divisors d(n): 12
• Complete list of divisors:
  1 2 4 7 14 28 751 1502 3004 5257 10514 21028
• Sum of all divisors σ(n): 42112
• Sum of proper divisors (its aliquot sum) s(n): 21084
• 21028 is an abundant number, because the sum of its proper divisors (21084) is greater than itself. Its abundance is 56

Bases of 21028

• Binary: 101001000100100₂
• Hexadecimal: 0x5224
• Base-36: G84

Squares and roots of 21028

• 21028 squared (21028²) is 442176784
• 21028 cubed (21028³) is 9298093413952
• The square root of 21028 is 145.0103444587
• The cube root of 21028 is 27.6014982033

Scales and comparisons

• 21,028 seconds is equal to 5 hours, 50 minutes, 28 seconds.
• To count from 1 to 21,028 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 21028 cubic inches would be around 2.3 feet tall.

Recreational maths with 21028

• 21028 backwards is 82012
• The number of decimal digits it has is: 5
• The sum of 21028's digits is 13
• More coming soon!