21918197988

Names of 21918197988

• Cardinal: 21918197988 can be written as Twenty-one billion, nine hundred eighteen million, one hundred ninety-seven thousand, nine hundred eighty-eight.

Scientific notation

• Scientific notation: 2.1918197988 × 10¹⁰

Factors of 21918197988

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 1417

Divisors of 21918197988

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 6 9 12 17 18 34 36 51 68 97 102 153 194 204 291 306 388 421 582 612 842 873 877 1164 1263 1649 1684 1746 1754 2526 2631 3298 3492 3508 3789 4947 5052 5262 6596 7157 7578 7893 9894 10524 14314 14841 14909 15156 15786 19788 21471 28628 29682 29818 31572 40837 42942 44727 59364 59636 64413 81674 85069 85884 89454 122511 128826 134181 163348 170138 178908 245022 255207 257652 268362 340276 367533 369217 490044 510414 536724 694229 735066 738434 765621 1020828 1107651 1388458 1446173 1470132 1476868 1531242 2082687 2215302 2776916 2892346 3062484 3322953 4165374 4338519 4430604 5784692 6248061 6276689 6645906 8330748 8677038 12496122 12553378 13015557 13291812 17354076 18830067 24992244 25106756 26031114 35814049 37660134 52062228 56490201 71628098 75320268 107442147 112980402 143256196 214884294 225960804 322326441 429768588 608838833 644652882 1217677666 1289305764 1826516499 2435355332 3653032998 5479549497 7306065996 10959098994 21918197988
• Sum of all divisors σ(n): 59476710384
• Sum of proper divisors (its aliquot sum) s(n): 37558512396
• 21918197988 is an abundant number, because the sum of its proper divisors (37558512396) is greater than itself. Its abundance is 15640314408

Bases of 21918197988

• Binary: 10100011010011011010010100011100100₂
• Hexadecimal: 0x51A6D28E4
• Base-36: A2HJ1T0

Squares and roots of 21918197988

• 21918197988 squared (21918197988²) is 480407403041167248144
• 21918197988 cubed (21918197988³) is 10529664574757217059441317534272
• The square root of 21918197988 is 148047.9584053761
• The cube root of 21918197988 is 2798.5621013407

Scales and comparisons

• 21,918,197,988 seconds is equal to 696 years, 48 weeks, 2 days, 20 hours, 19 minutes, 48 seconds.
• To count from 1 to 21,918,197,988 would take you about one thousand, three hundred ninety-three 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 21918197988 cubic inches would be around 233.2 feet tall.

Recreational maths with 21918197988

• 21918197988 backwards is 88979181912
• The number of decimal digits it has is: 11
• The sum of 21918197988's digits is 63
• More coming soon!