21387966028

Names of 21387966028

• Cardinal: 21387966028 can be written as Twenty-one billion, three hundred eighty-seven million, nine hundred sixty-six thousand and twenty-eight.

Scientific notation

• Scientific notation: 2.1387966028 × 10¹⁰

Factors of 21387966028

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 171

Divisors of 21387966028

• Number of divisors d(n): 216
• Complete list of divisors:
  1 2 4 11 13 22 26 31 41 44 52 62 73 82 124 143 146 164 169 286 292 338 341 403 451 533 572 676 682 803 806 902 949 961 1066 1271 1364 1606 1612 1804 1859 1898 1922 2132 2263 2542 2993 3212 3718 3796 3844 4433 4526 5084 5239 5863 5986 6929 7436 8866 9052 10439 10478 10571 11726 11972 12337 12493 13858 13981 16523 17732 20878 20956 21142 23452 24674 24893 24986 27716 27962 29419 32923 33046 38909 39401 41756 42284 49348 49786 49972 55924 57629 58838 65846 66092 70153 76219 77818 78802 92783 99572 115258 117676 131692 135707 137423 140306 152438 155636 157604 162409 181753 185566 214799 230516 271414 274846 280612 304876 323609 324818 363506 371132 382447 427999 429598 433411 505817 512213 542828 549692 647218 649636 727012 764894 771683 855998 859196 866822 911989 1011634 1020613 1024426 1206179 1294436 1529788 1543366 1711996 1733644 1786499 1823978 2023268 2041226 2048852 2362789 2412358 2876273 3086732 3572998 3647956 4082452 4206917 4725578 4824716 5563987 5634343 5752546 6658769 7145996 8413834 9451156 10031879 11127974 11268686 11505092 11855857 13267969 13317538 15680327 16827668 20063758 22255948 22537372 23711714 26535938 26635076 31360654 31639003 37391549 40127516 47423428 53071876 62721308 63278006 73246459 74783098 126556012 130414427 146492918 149566196 172483597 260828854 292985836 344967194 411307039 486090137 521657708 689934388 822614078 972180274 1645228156 1944360548 5346991507 10693983014 21387966028
• Sum of all divisors σ(n): 47441742768
• Sum of proper divisors (its aliquot sum) s(n): 26053776740
• 21387966028 is an abundant number, because the sum of its proper divisors (26053776740) is greater than itself. Its abundance is 4665810712

Bases of 21387966028

• Binary: 10011111010110100100111011001001100₂
• Hexadecimal: 0x4FAD2764C
• Base-36: 9TPUC7G

Squares and roots of 21387966028

• 21387966028 squared (21387966028²) is 457445090814882096784
• 21387966028 cubed (21387966028³) is 9783820062024073122841600053952
• The square root of 21387966028 is 146246.2513297351
• The cube root of 21387966028 is 2775.8105914543

Scales and comparisons

• 21,387,966,028 seconds is equal to 680 years, 3 weeks, 4 days, 21 hours, 40 minutes, 28 seconds.
• To count from 1 to 21,387,966,028 would take you about one thousand, three hundred sixty 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 21387966028 cubic inches would be around 231.3 feet tall.

Recreational maths with 21387966028

• 21387966028 backwards is 82066978312
• 21387966028 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21387966028's digits is 52
• More coming soon!