21155021568

Names of 21155021568

• Cardinal: 21155021568 can be written as Twenty-one billion, one hundred fifty-five million, twenty-one thousand, five hundred sixty-eight.

Scientific notation

• Scientific notation: 2.1155021568 × 10¹⁰

Factors of 21155021568

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 1801

Divisors of 21155021568

• Number of divisors d(n): 162
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 32 36 48 64 72 73 96 128 144 146 192 219 256 288 292 384 438 576 584 657 768 876 1152 1168 1314 1723 1752 2304 2336 2628 3446 3504 4672 5169 5256 5329 6892 7008 9344 10338 10512 10658 13784 14016 15507 15987 18688 20676 21024 21316 27568 28032 31014 31974 41352 42048 42632 47961 55136 56064 62028 63948 82704 84096 85264 95922 110272 124056 125779 127896 165408 168192 170528 191844 220544 248112 251558 255792 330816 341056 377337 383688 441088 496224 503116 511584 661632 682112 754674 767376 992448 1006232 1023168 1132011 1323264 1364224 1509348 1534752 1984896 2012464 2046336 2264022 3018696 3069504 3969792 4024928 4092672 4528044 6037392 6139008 8049856 9056088 9181867 12074784 12278016 16099712 18112176 18363734 24149568 27545601 32199424 36224352 36727468 48299136 55091202 72448704 73454936 82636803 96598272 110182404 144897408 146909872 165273606 220364808 289794816 293819744 330547212 440729616 587639488 661094424 881459232 1175278976 1322188848 1762918464 2350557952 2644377696 3525836928 5288755392 7051673856 10577510784 21155021568
• Sum of all divisors σ(n): 61878030396
• Sum of proper divisors (its aliquot sum) s(n): 40723008828
• 21155021568 is an abundant number, because the sum of its proper divisors (40723008828) is greater than itself. Its abundance is 19567987260

Bases of 21155021568

• Binary: 10011101100111100000000001100000000₂
• Hexadecimal: 0x4ECF00300
• Base-36: 9PV5J40

Squares and roots of 21155021568

• 21155021568 squared (21155021568²) is 447534937542545178624
• 21155021568 cubed (21155021568³) is 9467611256146076171405132562432
• The square root of 21155021568 is 145447.6592042649
• The cube root of 21155021568 is 2765.6963135295

Scales and comparisons

• 21,155,021,568 seconds is equal to 672 years, 34 weeks, 3 days, 18 hours, 52 minutes, 48 seconds.
• To count from 1 to 21,155,021,568 would take you about one thousand, three hundred forty-five 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 21155021568 cubic inches would be around 230.5 feet tall.

Recreational maths with 21155021568

• 21155021568 backwards is 86512055112
• 21155021568 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21155021568's digits is 36
• More coming soon!