21354840

Names of 21354840

• Cardinal: 21354840 can be written as Twenty-one million, three hundred fifty-four thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.135484 × 10⁷

Factors of 21354840

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 23

Divisors of 21354840

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 27 30 36 39 40 45 52 54 60 65 72 78 81 90 104 108 117 120 130 135 156 162 169 180 195 216 234 243 260 270 312 324 338 351 360 390 405 468 486 507 520 540 585 648 676 702 780 810 845 936 972 1014 1053 1080 1170 1215 1352 1404 1521 1560 1620 1690 1755 1944 2028 2106 2197 2340 2430 2535 2808 3042 3159 3240 3380 3510 4056 4212 4394 4563 4680 4860 5070 5265 6084 6318 6591 6760 7020 7605 8424 8788 9126 9720 10140 10530 10985 12168 12636 13182 13689 14040 15210 15795 17576 18252 19773 20280 21060 21970 22815 25272 26364 27378 30420 31590 32955 36504 39546 41067 42120 43940 45630 52728 54756 59319 60840 63180 65910 68445 79092 82134 87880 91260 98865 109512 118638 126360 131820 136890 158184 164268 177957 182520 197730 205335 237276 263640 273780 296595 328536 355914 395460 410670 474552 533871 547560 593190 711828 790920 821340 889785 1067742 1186380 1423656 1642680 1779570 2135484 2372760 2669355 3559140 4270968 5338710 7118280 10677420 21354840
• Sum of all divisors σ(n): 77968800
• Sum of proper divisors (its aliquot sum) s(n): 56613960
• 21354840 is an abundant number, because the sum of its proper divisors (56613960) is greater than itself. Its abundance is 35259120

Bases of 21354840

• Binary: 1010001011101100101011000₂
• Hexadecimal: 0x145D958
• Base-36: CPPI0

Squares and roots of 21354840

• 21354840 squared (21354840²) is 456029191425600
• 21354840 cubed (21354840³) is 9738430418223059904000
• The square root of 21354840 is 4621.1297320027
• The cube root of 21354840 is 277.4376777501

Scales and comparisons

• 21,354,840 seconds is equal to 35 weeks, 2 days, 3 hours, 54 minutes.
• To count from 1 to 21,354,840 would take you about six 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 21354840 cubic inches would be around 23.1 feet tall.

Recreational maths with 21354840

• 21354840 backwards is 04845312
• 21354840 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21354840's digits is 27
• More coming soon!