21123690

Names of 21123690

• Cardinal: 21123690 can be written as Twenty-one million, one hundred twenty-three thousand, six hundred ninety.

Scientific notation

• Scientific notation: 2.112369 × 10⁷

Factors of 21123690

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 192

Divisors of 21123690

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 5 6 7 10 14 15 17 21 30 34 35 42 51 61 70 85 97 102 105 119 122 170 183 194 210 238 255 291 305 357 366 427 485 510 582 595 610 679 714 854 915 970 1037 1190 1281 1358 1455 1649 1785 1830 2037 2074 2135 2562 2910 3111 3298 3395 3570 4074 4270 4947 5185 5917 6222 6405 6790 7259 8245 9894 10185 10370 11543 11834 12810 14518 15555 16490 17751 20370 21777 23086 24735 29585 31110 34629 35502 36295 41419 43554 49470 57715 59170 69258 72590 82838 88755 100589 108885 115430 124257 173145 177510 201178 207095 217770 248514 301767 346290 414190 502945 603534 621285 704123 1005890 1242570 1408246 1508835 2112369 3017670 3520615 4224738 7041230 10561845 21123690
• Sum of all divisors σ(n): 62995968
• Sum of proper divisors (its aliquot sum) s(n): 41872278
• 21123690 is an abundant number, because the sum of its proper divisors (41872278) is greater than itself. Its abundance is 20748588

Bases of 21123690

• Binary: 1010000100101001001101010₂
• Hexadecimal: 0x142526A
• Base-36: CKR56

Squares and roots of 21123690

• 21123690 squared (21123690²) is 446210279216100
• 21123690 cubed (21123690³) is 9425607612974339409000
• The square root of 21123690 is 4596.0515662903
• The cube root of 21123690 is 276.4330264081

Scales and comparisons

• 21,123,690 seconds is equal to 34 weeks, 6 days, 11 hours, 41 minutes, 30 seconds.
• To count from 1 to 21,123,690 would take you about two 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 21123690 cubic inches would be around 23 feet tall.

Recreational maths with 21123690

• 21123690 backwards is 09632112
• The number of decimal digits it has is: 8
• The sum of 21123690's digits is 24
• More coming soon!