21205678173220

Names of 21205678173220

• Cardinal: 21205678173220 can be written as Twenty-one trillion, two hundred five billion, six hundred seventy-eight million, one hundred seventy-three thousand, two hundred twenty.

Scientific notation

• Scientific notation: 2.120567817322 × 10¹³

Factors of 21205678173220

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 22371

Divisors of 21205678173220

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 5 10 20 31 62 124 155 310 620 941 1861 1882 3722 3764 4705 7444 9305 9410 18610 18820 19531 29171 37220 39062 57691 58342 78124 97655 115382 116684 145855 195310 230764 288455 291710 390620 576910 583420 605461 1153820 1210922 1751201 2421844 3027305 3502402 6054610 7004804 8756005 12109220 17512010 18378671 35024020 36347191 36757342 54287231 72694382 73514684 91893355 108574462 145388764 181735955 183786710 217148924 271436155 363471910 367573420 542872310 569738801 726943820 1085744620 1126762921 1139477602 2253525842 2278955204 2848694005 4507051684 5633814605 5697388010 11267629210 11394776020 22535258420 34202706731 68405413462 136810826924 171013533655 342027067310 684054134620 1060283908661 2120567817322 4241135634644 5301419543305 10602839086610 21205678173220
• Sum of all divisors σ(n): 46044373036032
• Sum of proper divisors (its aliquot sum) s(n): 24838694862812
• 21205678173220 is an abundant number, because the sum of its proper divisors (24838694862812) is greater than itself. Its abundance is 3633016689592

Bases of 21205678173220

• Binary: 100110100100101010100111010100010110000100100₂
• Hexadecimal: 0x134954EA2C24
• Base-36: 7ILR59PUS

Squares and roots of 21205678173220

• 21205678173220 squared (21205678173220²) is 449680786786179116325168400
• 21205678173220 cubed (21205678173220³) is 9535786045268075078218010916020870248000
• The square root of 21205678173220 is 4604962.3422151891
• The cube root of 21205678173220 is 27679.0207995727

Scales and comparisons

• 21,205,678,173,220 seconds is equal to 674,274 years, 50 weeks, 3 days, 23 hours, 13 minutes, 40 seconds.
• To count from 1 to 21,205,678,173,220 would take you about one million, six hundred eighty-five thousand, six hundred eighty-seven 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 21205678173220 cubic inches would be around 2306.6 feet tall.

Recreational maths with 21205678173220

• 21205678173220 backwards is 02237187650212
• The number of decimal digits it has is: 14
• The sum of 21205678173220's digits is 46
• More coming soon!