21147280

Names of 21147280

• Cardinal: 21147280 can be written as Twenty-one million, one hundred forty-seven thousand, two hundred eighty.

Scientific notation

• Scientific notation: 2.114728 × 10⁷

Factors of 21147280

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 3458

Divisors of 21147280

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 4 5 7 8 10 11 14 16 20 22 28 35 40 44 55 56 70 77 80 88 110 112 140 154 176 220 280 308 385 440 560 616 770 880 1232 1540 3080 3433 6160 6866 13732 17165 24031 27464 34330 37763 48062 54928 68660 75526 96124 120155 137320 151052 188815 192248 240310 264341 274640 302104 377630 384496 480620 528682 604208 755260 961240 1057364 1321705 1510520 1922480 2114728 2643410 3021040 4229456 5286820 10573640 21147280
• Sum of all divisors σ(n): 61317504
• Sum of proper divisors (its aliquot sum) s(n): 40170224
• 21147280 is an abundant number, because the sum of its proper divisors (40170224) is greater than itself. Its abundance is 19022944

Bases of 21147280

• Binary: 1010000101010111010010000₂
• Hexadecimal: 0x142AE90
• Base-36: CL9CG

Squares and roots of 21147280

• 21147280 squared (21147280²) is 447207451398400
• 21147280 cubed (21147280³) is 9457221192808356352000
• The square root of 21147280 is 4598.6171834585
• The cube root of 21147280 is 276.5358908401

Scales and comparisons

• 21,147,280 seconds is equal to 34 weeks, 6 days, 18 hours, 14 minutes, 40 seconds.
• To count from 1 to 21,147,280 would take you about three days!

  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 21147280 cubic inches would be around 23 feet tall.

Recreational maths with 21147280

• 21147280 backwards is 08274112
• The number of decimal digits it has is: 8
• The sum of 21147280's digits is 25
• More coming soon!