21872970

Names of 21872970

• Cardinal: 21872970 can be written as Twenty-one million, eight hundred seventy-two thousand, nine hundred seventy.

Scientific notation

• Scientific notation: 2.187297 × 10⁷

Factors of 21872970

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 251

Divisors of 21872970

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 5 6 7 9 10 14 15 18 21 27 30 35 42 45 54 63 70 71 90 105 126 135 142 163 189 210 213 270 315 326 355 378 426 489 497 630 639 710 815 945 978 994 1065 1141 1278 1467 1491 1630 1890 1917 2130 2282 2445 2485 2934 2982 3195 3423 3834 4401 4473 4890 4970 5705 6390 6846 7335 7455 8802 8946 9585 10269 11410 11573 13419 14670 14910 17115 19170 20538 22005 22365 23146 26838 30807 34230 34719 44010 44730 51345 57865 61614 67095 69438 81011 102690 104157 115730 134190 154035 162022 173595 208314 243033 308070 312471 347190 405055 486066 520785 624942 729099 810110 1041570 1215165 1458198 1562355 2187297 2430330 3124710 3645495 4374594 7290990 10936485 21872970
• Sum of all divisors σ(n): 68014080
• Sum of proper divisors (its aliquot sum) s(n): 46141110
• 21872970 is an abundant number, because the sum of its proper divisors (46141110) is greater than itself. Its abundance is 24268140

Bases of 21872970

• Binary: 1010011011100000101001010₂
• Hexadecimal: 0x14DC14A
• Base-36: D0TAI

Squares and roots of 21872970

• 21872970 squared (21872970²) is 478426816620900
• 21872970 cubed (21872970³) is 10464615407144447073000
• The square root of 21872970 is 4676.8547123039
• The cube root of 21872970 is 279.6635840583

Scales and comparisons

• 21,872,970 seconds is equal to 36 weeks, 1 day, 3 hours, 49 minutes, 30 seconds.
• To count from 1 to 21,872,970 would take you about two weeks!

  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 21872970 cubic inches would be around 23.3 feet tall.

Recreational maths with 21872970

• 21872970 backwards is 07927812
• The number of decimal digits it has is: 8
• The sum of 21872970's digits is 36
• More coming soon!