21721997780

Names of 21721997780

• Cardinal: 21721997780 can be written as Twenty-one billion, seven hundred twenty-one million, nine hundred ninety-seven thousand, seven hundred eighty.

Scientific notation

• Scientific notation: 2.172199778 × 10¹⁰

Factors of 21721997780

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 4759

Divisors of 21721997780

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 5 7 10 14 20 28 35 70 140 149 239 298 478 596 745 956 1043 1195 1490 1673 2086 2390 2980 3346 4172 4357 4780 5215 6692 8365 8714 10430 16730 17428 20860 21785 30499 33460 35611 43570 60998 71222 87140 121996 142444 152495 178055 249277 304990 356110 498554 609980 649193 712220 997108 1041323 1246385 1298386 2082646 2492770 2596772 3245965 4165292 4544351 4985540 5206615 6491930 7289261 9088702 10413230 12983860 14578522 18177404 20826460 22721755 29157044 36446305 45443510 72892610 90887020 145785220 155157127 310314254 620628508 775785635 1086099889 1551571270 2172199778 3103142540 4344399556 5430499445 10860998890 21721997780
• Sum of all divisors σ(n): 52714368000
• Sum of proper divisors (its aliquot sum) s(n): 30992370220
• 21721997780 is an abundant number, because the sum of its proper divisors (30992370220) is greater than itself. Its abundance is 9270372440

Bases of 21721997780

• Binary: 10100001110101110110110000111010100₂
• Hexadecimal: 0x50EBB61D4
• Base-36: 9Z8PSR8

Squares and roots of 21721997780

• 21721997780 squared (21721997780²) is 471845187554324928400
• 21721997780 cubed (21721997780³) is 10249420116558729724103458952000
• The square root of 21721997780 is 147383.8450441567
• The cube root of 21721997780 is 2790.1866406489

Scales and comparisons

• 21,721,997,780 seconds is equal to 690 years, 36 weeks, 16 minutes, 20 seconds.
• To count from 1 to 21,721,997,780 would take you about one thousand, three hundred eighty-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 21721997780 cubic inches would be around 232.5 feet tall.

Recreational maths with 21721997780

• 21721997780 backwards is 08779912712
• The number of decimal digits it has is: 11
• The sum of 21721997780's digits is 53
• More coming soon!