21145140

Names of 21145140

• Cardinal: 21145140 can be written as Twenty-one million, one hundred forty-five thousand, one hundred forty.

Scientific notation

• Scientific notation: 2.114514 × 10⁷

Factors of 21145140

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 1576

Divisors of 21145140

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 79 90 158 180 237 316 395 474 711 790 948 1185 1422 1487 1580 2370 2844 2974 3555 4461 4740 5948 7110 7435 8922 13383 14220 14870 17844 22305 26766 29740 44610 53532 66915 89220 117473 133830 234946 267660 352419 469892 587365 704838 1057257 1174730 1409676 1762095 2114514 2349460 3524190 4229028 5286285 7048380 10572570 21145140
• Sum of all divisors σ(n): 64995840
• Sum of proper divisors (its aliquot sum) s(n): 43850700
• 21145140 is an abundant number, because the sum of its proper divisors (43850700) is greater than itself. Its abundance is 22705560

Bases of 21145140

• Binary: 1010000101010011000110100₂
• Hexadecimal: 0x142A634
• Base-36: CL7P0

Squares and roots of 21145140

• 21145140 squared (21145140²) is 447116945619600
• 21145140 cubed (21145140³) is 9454350411498828744000
• The square root of 21145140 is 4598.3844989301
• The cube root of 21145140 is 276.5265625047

Scales and comparisons

• 21,145,140 seconds is equal to 34 weeks, 6 days, 17 hours, 39 minutes.
• To count from 1 to 21,145,140 would take you about three days!

  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 21145140 cubic inches would be around 23 feet tall.

Recreational maths with 21145140

• 21145140 backwards is 04154112
• 21145140 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21145140's digits is 18
• More coming soon!