21157943840

Names of 21157943840

• Cardinal: 21157943840 can be written as Twenty-one billion, one hundred fifty-seven million, nine hundred forty-three thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.115794384 × 10¹⁰

Factors of 21157943840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 29592

Divisors of 21157943840

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 4 5 8 10 11 16 20 22 32 37 40 44 55 74 80 88 110 121 148 160 176 185 220 242 296 352 370 407 440 484 592 605 740 814 880 968 1184 1210 1480 1628 1760 1936 2035 2420 2960 3256 3872 4070 4477 4840 5920 6512 8140 8954 9680 13024 16280 17908 19360 22385 29537 32560 35816 44770 59074 65120 71632 89540 118148 143264 147685 179080 236296 295370 324907 358160 472592 590740 649814 716320 945184 1092869 1181480 1299628 1624535 2185738 2362960 2599256 3249070 3573977 4371476 4725920 5198512 5464345 6498140 7147954 8742952 10397024 10928690 12021559 12996280 14295908 17485904 17869885 21857380 24043118 25992560 28591816 34971808 35739770 43714760 48086236 51985120 57183632 60107795 71479540 87429520 96172472 114367264 120215590 132237149 142959080 174859040 192344944 240431180 264474298 285918160 384689888 480862360 528948596 571836320 661185745 961724720 1057897192 1322371490 1923449440 2115794384 2644742980 4231588768 5289485960 10578971920 21157943840
• Sum of all divisors σ(n): 56429749656
• Sum of proper divisors (its aliquot sum) s(n): 35271805816
• 21157943840 is an abundant number, because the sum of its proper divisors (35271805816) is greater than itself. Its abundance is 14113861976

Bases of 21157943840

• Binary: 10011101101000111001001101000100000₂
• Hexadecimal: 0x4ED1C9A20
• Base-36: 9PWW5Y8

Squares and roots of 21157943840

• 21157943840 squared (21157943840²) is 447658587536593945600
• 21157943840 cubed (21157943840³) is 9471535254592978645888815104000
• The square root of 21157943840 is 145457.7046429649
• The cube root of 21157943840 is 2765.8236551595

Scales and comparisons

• 21,157,943,840 seconds is equal to 672 years, 39 weeks, 2 days, 14 hours, 37 minutes, 20 seconds.
• To count from 1 to 21,157,943,840 would take you about one thousand, three hundred forty-five years!

  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 21157943840 cubic inches would be around 230.5 feet tall.

Recreational maths with 21157943840

• 21157943840 backwards is 04834975112
• 21157943840 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21157943840's digits is 44
• More coming soon!