21505001000

Names of 21505001000

• Cardinal: 21505001000 can be written as Twenty-one billion, five hundred five million, one thousand.

Scientific notation

• Scientific notation: 2.1505001 × 10¹⁰

Factors of 21505001000

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 50438

Divisors of 21505001000

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 4 5 7 8 10 14 20 25 28 35 40 50 56 61 70 100 122 125 140 175 200 244 250 280 305 350 427 488 500 610 700 854 875 1000 1220 1400 1525 1708 1750 2135 2440 3050 3416 3500 4270 6100 7000 7625 8540 10675 12200 15250 17080 21350 30500 42700 50363 53375 61000 85400 100726 106750 201452 213500 251815 352541 402904 427000 503630 705082 1007260 1259075 1410164 1762705 2014520 2518150 2820328 3072143 3525410 5036300 6144286 6295375 7050820 8813525 10072600 12288572 12590750 14101640 15360715 17627050 21505001 24577144 25181500 30721430 35254100 43010002 44067625 50363000 61442860 70508200 76803575 86020004 88135250 107525005 122885720 153607150 172040008 176270500 215050010 307214300 352541000 384017875 430100020 537625025 614428600 768035750 860200040 1075250050 1536071500 2150500100 2688125125 3072143000 4301000200 5376250250 10752500500 21505001000
• Sum of all divisors σ(n): 58454472960
• Sum of proper divisors (its aliquot sum) s(n): 36949471960
• 21505001000 is an abundant number, because the sum of its proper divisors (36949471960) is greater than itself. Its abundance is 15444470960

Bases of 21505001000

• Binary: 10100000001110011000100011000101000₂
• Hexadecimal: 0x501CC4628
• Base-36: 9VNISYW

Squares and roots of 21505001000

• 21505001000 squared (21505001000²) is 462465068010001000000
• 21505001000 cubed (21505001000³) is 9945311750020139515001000000000
• The square root of 21505001000 is 146645.8352630581
• The cube root of 21505001000 is 2780.8644638343

Scales and comparisons

• 21,505,001,000 seconds is equal to 683 years, 41 weeks, 1 day, 11 hours, 23 minutes, 20 seconds.
• To count from 1 to 21,505,001,000 would take you about one thousand, three hundred sixty-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 21505001000 cubic inches would be around 231.7 feet tall.

Recreational maths with 21505001000

• 21505001000 backwards is 00010050512
• 21505001000 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21505001000's digits is 14
• More coming soon!