21391437744

Names of 21391437744

• Cardinal: 21391437744 can be written as Twenty-one billion, three hundred ninety-one million, four hundred thirty-seven thousand, seven hundred forty-four.

Scientific notation

• Scientific notation: 2.1391437744 × 10¹⁰

Factors of 21391437744

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 1137

Divisors of 21391437744

• Number of divisors d(n): 210
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 27 36 41 48 54 72 81 82 108 123 144 162 164 216 243 246 324 328 369 432 486 492 648 656 729 738 972 984 1091 1107 1296 1458 1476 1681 1944 1968 2182 2214 2916 2952 3273 3321 3362 3888 4364 4428 5043 5832 5904 6546 6642 6724 8728 8856 9819 9963 10086 11664 13092 13284 13448 15129 17456 17712 19638 19926 20172 26184 26568 26896 29457 29889 30258 39276 39852 40344 44731 45387 52368 53136 58914 59778 60516 78552 79704 80688 88371 89462 90774 117828 119556 121032 134193 136161 157104 159408 176742 178924 181548 235656 239112 242064 265113 268386 272322 353484 357848 363096 402579 408483 471312 478224 530226 536772 544644 706968 715696 726192 795339 805158 816966 1060452 1073544 1089288 1207737 1225449 1413936 1590678 1610316 1633932 1833971 2120904 2147088 2178576 2415474 2450898 3181356 3220632 3267864 3623211 3667942 4241808 4830948 4901796 5501913 6362712 6441264 6535728 7246422 7335884 9661896 9803592 10869633 11003826 12725424 14492844 14671768 16505739 19323792 19607184 21739266 22007652 28985688 29343536 32608899 33011478 43478532 44015304 49517217 57971376 65217798 66022956 86957064 88030608 99034434 130435596 132045912 148551651 173914128 198068868 260871192 264091824 297103302 396137736 445654953 521742384 594206604 792275472 891309906 1188413208 1336964859 1782619812 2376826416 2673929718 3565239624 5347859436 7130479248 10695718872 21391437744
• Sum of all divisors σ(n): 63751406628
• Sum of proper divisors (its aliquot sum) s(n): 42359968884
• 21391437744 is an abundant number, because the sum of its proper divisors (42359968884) is greater than itself. Its abundance is 20968531140

Bases of 21391437744

• Binary: 10011111011000001110110111110110000₂
• Hexadecimal: 0x4FB076FB0
• Base-36: 9TRWR00

Squares and roots of 21391437744

• 21391437744 squared (21391437744²) is 457593608755427809536
• 21391437744 cubed (21391437744³) is 9788585193744027309775633526784
• The square root of 21391437744 is 146258.1202668761
• The cube root of 21391437744 is 2775.9607741109

Scales and comparisons

• 21,391,437,744 seconds is equal to 680 years, 9 weeks, 3 days, 2 hours, 2 minutes, 24 seconds.
• To count from 1 to 21,391,437,744 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 21391437744 cubic inches would be around 231.3 feet tall.

Recreational maths with 21391437744

• 21391437744 backwards is 44773419312
• The number of decimal digits it has is: 11
• The sum of 21391437744's digits is 45
• More coming soon!