21351422778

Names of 21351422778

• Cardinal: 21351422778 can be written as Twenty-one billion, three hundred fifty-one million, four hundred twenty-two thousand, seven hundred seventy-eight.

Scientific notation

• Scientific notation: 2.1351422778 × 10¹⁰

Factors of 21351422778

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 3233

Divisors of 21351422778

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 3 6 7 14 21 42 49 98 147 294 343 686 1029 2058 3221 6442 9663 19326 22547 45094 67641 135282 157829 315658 473487 946974 1104803 2209606 3314409 6628818 10374841 20749682 31124523 62249046 72623887 145247774 217871661 435743322 508367209 1016734418 1525101627 3050203254 3558570463 7117140926 10675711389 21351422778
• Sum of all divisors σ(n): 49814702400
• Sum of proper divisors (its aliquot sum) s(n): 28463279622
• 21351422778 is an abundant number, because the sum of its proper divisors (28463279622) is greater than itself. Its abundance is 7111856844

Bases of 21351422778

• Binary: 10011111000101001001101101100111010₂
• Hexadecimal: 0x4F8A4DB3A
• Base-36: 9T43396

Squares and roots of 21351422778

• 21351422778 squared (21351422778²) is 455883254644897237284
• 21351422778 cubed (21351422778³) is 9733756107333833173614868454952
• The square root of 21351422778 is 146121.2605270021
• The cube root of 21351422778 is 2774.2287834627

Scales and comparisons

• 21,351,422,778 seconds is equal to 678 years, 47 weeks, 1 day, 22 hours, 46 minutes, 18 seconds.
• To count from 1 to 21,351,422,778 would take you about one thousand, three hundred fifty-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 21351422778 cubic inches would be around 231.2 feet tall.

Recreational maths with 21351422778

• 21351422778 backwards is 87722415312
• 21351422778 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21351422778's digits is 42
• More coming soon!