21208916421

Names of 21208916421

• Cardinal: 21208916421 can be written as Twenty-one billion, two hundred eight million, nine hundred sixteen thousand, four hundred twenty-one.

Scientific notation

• Scientific notation: 2.1208916421 × 10¹⁰

Factors of 21208916421

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 407

Divisors of 21208916421

• Number of divisors d(n): 216
• Complete list of divisors:
  1 3 7 9 11 19 21 27 33 49 57 63 77 99 121 133 147 171 189 209 231 297 361 363 367 399 441 513 539 627 693 847 931 1083 1089 1101 1197 1323 1463 1617 1881 2079 2299 2527 2541 2569 2793 3249 3267 3303 3591 3971 4037 4389 4851 5643 5929 6897 6973 7581 7623 7707 8379 9747 9909 10241 11913 12111 13167 14553 16093 17689 17787 17983 20691 20919 22743 22869 23121 25137 27797 28259 30723 35739 36333 39501 43681 44407 48279 48811 53067 53361 53949 62073 62757 68229 69363 76703 83391 84777 92169 107217 108999 112651 131043 132487 133221 144837 146433 159201 160083 161847 188271 194579 197813 230109 250173 254331 276507 305767 310849 337953 341677 393129 397461 399663 434511 439299 477603 485541 536921 583737 593439 690327 750519 762993 843733 917301 927409 932547 1013859 1025031 1179387 1192383 1198989 1317897 1457357 1610763 1751211 1780317 2070981 2140369 2175943 2531199 2751903 2782227 2797641 3041577 3075093 3577149 3758447 4372071 4832289 5253633 5340951 5906131 6421107 6491863 6527829 7593597 8255709 8346681 8392923 9225279 10201499 11275341 13116213 14496867 16030927 17718393 19263321 19475589 19583487 22780791 25040043 30604497 33826023 39348639 41342917 48092781 53155179 57789963 58426767 58750461 71410493 91813491 101478069 112216489 124028751 144278343 159465537 175280301 214231479 275440473 336649467 372086253 432835029 642694437 785515423 1009948401 1116258759 1928083311 2356546269 3029845203 7069638807 21208916421
• Sum of all divisors σ(n): 42516673920
• Sum of proper divisors (its aliquot sum) s(n): 21307757499
• 21208916421 is an abundant number, because the sum of its proper divisors (21307757499) is greater than itself. Its abundance is 98841078

Bases of 21208916421

• Binary: 10011110000001001100110000111000101₂
• Hexadecimal: 0x4F02661C5
• Base-36: 9QR8ON9

Squares and roots of 21208916421

• 21208916421 squared (21208916421²) is 449818135752963449241
• 21208916421 cubed (21208916421³) is 9540155245834633698020244886461
• The square root of 21208916421 is 145632.8136822193
• The cube root of 21208916421 is 2768.0429651247

Scales and comparisons

• 21,208,916,421 seconds is equal to 674 years, 19 weeks, 4 days, 13 hours, 40 minutes, 21 seconds.
• To count from 1 to 21,208,916,421 would take you about one thousand, three hundred forty-eight 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 21208916421 cubic inches would be around 230.7 feet tall.

Recreational maths with 21208916421

• 21208916421 backwards is 12461980212
• The number of decimal digits it has is: 11
• The sum of 21208916421's digits is 36
• More coming soon!