21405387960

Names of 21405387960

• Cardinal: 21405387960 can be written as Twenty-one billion, four hundred five million, three hundred eighty-seven thousand, nine hundred sixty.

Scientific notation

• Scientific notation: 2.140538796 × 10¹⁰

Factors of 21405387960

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 125771

Divisors of 21405387960

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 11 12 15 18 20 22 24 30 33 36 40 43 44 45 55 60 66 72 86 88 90 99 110 120 129 132 165 172 180 198 215 220 258 264 330 344 360 387 396 430 440 473 495 516 645 660 774 792 860 946 990 1032 1290 1320 1419 1548 1720 1892 1935 1980 2365 2580 2838 3096 3784 3870 3960 4257 4730 5160 5676 7095 7740 8514 9460 11352 14190 15480 17028 18920 21285 28380 34056 42570 56760 85140 125707 170280 251414 377121 502828 628535 754242 1005656 1131363 1257070 1382777 1508484 1885605 2262726 2514140 2765554 3016968 3771210 4148331 4525452 5028280 5405401 5531108 5656815 6913885 7542420 8296662 9050904 10810802 11062216 11313630 12444993 13827770 15084840 16216203 16593324 20741655 21621604 22627260 24889986 27027005 27655540 32432406 33186648 41483310 43243208 45254520 48648609 49779972 54054010 55311080 59459411 62224965 64864812 81081015 82966620 97297218 99559944 108108020 118918822 124449930 129729624 162162030 165933240 178378233 194594436 216216040 237837644 243243045 248899860 297297055 324324060 356756466 389188872 475675288 486486090 497799720 535134699 594594110 648648120 713512932 891891165 972972180 1070269398 1189188220 1427025864 1783782330 1945944360 2140538796 2378376440 2675673495 3567564660 4281077592 5351346990 7135129320 10702693980 21405387960
• Sum of all divisors σ(n): 77657374080
• Sum of proper divisors (its aliquot sum) s(n): 56251986120
• 21405387960 is an abundant number, because the sum of its proper divisors (56251986120) is greater than itself. Its abundance is 34846598160

Bases of 21405387960

• Binary: 10011111011110111000100110010111000₂
• Hexadecimal: 0x4FBDC4CB8
• Base-36: 9U07R20

Squares and roots of 21405387960

• 21405387960 squared (21405387960²) is 458190633718112961600
• 21405387960 cubed (21405387960³) is 9807748274374465222152582336000
• The square root of 21405387960 is 146305.8028924349
• The cube root of 21405387960 is 2776.5640814999

Scales and comparisons

• 21,405,387,960 seconds is equal to 680 years, 32 weeks, 3 days, 13 hours, 6 minutes.
• To count from 1 to 21,405,387,960 would take you about one thousand, three hundred sixty-one 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 21405387960 cubic inches would be around 231.4 feet tall.

Recreational maths with 21405387960

• 21405387960 backwards is 06978350412
• 21405387960 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21405387960's digits is 45
• More coming soon!