21001789809

Names of 21001789809

• Cardinal: 21001789809 can be written as Twenty-one billion, one million, seven hundred eighty-nine thousand, eight hundred nine.

Scientific notation

• Scientific notation: 2.1001789809 × 10¹⁰

Factors of 21001789809

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 8142

Divisors of 21001789809

• Number of divisors d(n): 128
• Complete list of divisors:
  1 3 7 9 11 13 21 27 33 39 63 77 91 97 99 117 143 189 231 273 291 297 351 429 679 693 819 873 1001 1067 1261 1287 2037 2079 2457 2619 3003 3201 3783 3861 6111 7469 8011 8827 9009 9603 11349 13871 18333 22407 24033 26481 27027 28809 34047 41613 56077 67221 72099 79443 88121 97097 104143 124839 168231 201663 216297 238329 264363 291291 312429 374517 504693 616847 729001 777067 793089 873873 937287 1145573 1514079 1850541 2187003 2331201 2379267 2621619 2811861 3436719 5439469 5551623 6561009 6993603 8019011 8547737 10101871 10310157 16318407 16654869 19683027 20980809 24057033 25643211 30305613 30930471 48955221 59834159 70713097 72171099 76929633 90916839 111120581 146865663 179502477 212139291 216513297 230788899 272750517 333361743 538507431 636417873 777844067 1000085229 1615522293 1909253619 2333532201 3000255687 7000596603 21001789809
• Sum of all divisors σ(n): 42211061760
• Sum of proper divisors (its aliquot sum) s(n): 21209271951
• 21001789809 is an abundant number, because the sum of its proper divisors (21209271951) is greater than itself. Its abundance is 207482142

Bases of 21001789809

• Binary: 10011100011110011011110000101110001₂
• Hexadecimal: 0x4E3CDE171
• Base-36: 9NBX8Q9

Squares and roots of 21001789809

• 21001789809 squared (21001789809²) is 441075175181416256481
• 21001789809 cubed (21001789809³) is 9263368119127957661549596002129
• The square root of 21001789809 is 144919.9427580621
• The cube root of 21001789809 is 2759.0025542707

Scales and comparisons

• 21,001,789,809 seconds is equal to 667 years, 41 weeks, 1 day, 6 hours, 30 minutes, 9 seconds.
• To count from 1 to 21,001,789,809 would take you about one thousand, three hundred thirty-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 21001789809 cubic inches would be around 229.9 feet tall.

Recreational maths with 21001789809

• 21001789809 backwards is 90898710012
• The number of decimal digits it has is: 11
• The sum of 21001789809's digits is 45
• More coming soon!