21390343821

Names of 21390343821

• Cardinal: 21390343821 can be written as Twenty-one billion, three hundred ninety million, three hundred forty-three thousand, eight hundred twenty-one.

Scientific notation

• Scientific notation: 2.1390343821 × 10¹⁰

Factors of 21390343821

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 312

Divisors of 21390343821

• Number of divisors d(n): 216
• Complete list of divisors:
  1 3 7 9 11 21 31 33 49 63 67 77 93 99 121 147 193 201 217 231 279 341 363 441 469 539 579 603 651 693 737 847 1023 1089 1351 1407 1519 1617 1737 1953 2077 2123 2211 2387 2541 3069 3283 3751 4053 4221 4557 4851 5159 5929 5983 6231 6369 6633 7161 7623 8107 9457 9849 11253 12159 12931 13671 14539 14861 15477 16709 17787 17949 18693 19107 21483 22847 23353 24321 26257 28371 29547 33759 36113 38793 41881 43617 44583 46431 50127 53361 53847 56749 65813 68541 70059 72963 78771 85113 90517 101773 104027 108339 116379 125643 130851 133749 142241 150381 159929 163471 170247 183799 197439 205623 210177 236313 251317 271551 293167 305319 312081 325017 376929 397243 400861 426723 460691 479787 490413 510741 551397 592317 633619 723943 753951 814653 879501 915957 936243 995687 1119503 1144297 1191729 1202583 1280169 1382073 1439361 1471239 1564651 1654191 1759219 1900857 2171829 2261853 2638503 2806027 2987061 3224837 3358509 3432891 3575187 3607749 4146219 4409471 4693953 5067601 5277657 5702571 6515487 6969809 8418081 8961183 9674511 10075527 10298673 10952557 12314533 13228413 14081859 15202803 15832971 19642189 20909427 25254243 29023533 30866297 32857671 35473207 36943599 39685239 45608409 48504181 58926567 62728281 76667899 92598891 98573013 106419621 110830797 145512543 176779701 216064079 230003697 277796673 319258863 339529267 436537629 648192237 690011091 1018587801 1944576711 2376704869 3055763403 7130114607 21390343821
• Sum of all divisors σ(n): 41603557632
• Sum of proper divisors (its aliquot sum) s(n): 20213213811
• 21390343821 is a deficient number, because the sum of its proper divisors (20213213811) is less than itself. Its deficiency is 1177130010

Bases of 21390343821

• Binary: 10011111010111101101011111010001101₂
• Hexadecimal: 0x4FAF6BE8D
• Base-36: 9TR9AX9

Squares and roots of 21390343821

• 21390343821 squared (21390343821²) is 457546808780592880041
• 21390343821 cubed (21390343821³) is 9787083554018223456301598576661
• The square root of 21390343821 is 146254.3805190121
• The cube root of 21390343821 is 2775.9134539457

Scales and comparisons

• 21,390,343,821 seconds is equal to 680 years, 7 weeks, 4 days, 10 hours, 10 minutes, 21 seconds.
• To count from 1 to 21,390,343,821 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 21390343821 cubic inches would be around 231.3 feet tall.

Recreational maths with 21390343821

• 21390343821 backwards is 12834309312
• The number of decimal digits it has is: 11
• The sum of 21390343821's digits is 36
• More coming soon!