21285

21,285 is an odd composite number composed of four prime numbers multiplied together.

What does the number 21285 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 24 divisors.

21285 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 21285:

3² × 5 × 11 × 43

(3 × 3 × 5 × 11 × 43)

See below for interesting mathematical facts about the number 21285 from the Numbermatics database.

Names of 21285

Cardinal: 21285 can be written as Twenty-one thousand, two hundred eighty-five.

Scientific notation

Scientific notation: 2.1285 × 10⁴

Factors of 21285

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 5
Sum of prime factors: 62

Divisors of 21285

Number of divisors d(n): 24
Complete list of divisors:
1 3 5 9 11 15 33 43 45 55 99 129 165 215 387 473 495 645 1419 1935 2365 4257 7095 21285
Sum of all divisors σ(n): 41184
Sum of proper divisors (its aliquot sum) s(n): 19899
21285 is a deficient number, because the sum of its proper divisors (19899) is less than itself. Its deficiency is 1386

Bases of 21285

Binary: 101001100100101₂
Hexadecimal: 0x5325
Base-36: GF9

Squares and roots of 21285

21285 squared (21285²) is 453051225
21285 cubed (21285³) is 9643195324125
The square root of 21285 is 145.8937969895
The cube root of 21285 is 27.7134898475

Scales and comparisons

How big is 21285?

21,285 seconds is equal to 5 hours, 54 minutes, 45 seconds.
To count from 1 to 21,285 would take you about five hours.

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 21285 cubic inches would be around 2.3 feet tall.

Recreational maths with 21285

21285 backwards is 58212
The number of decimal digits it has is: 5
The sum of 21285's digits is 18
More coming soon!

Copy this link to share with anyone:

Share this page on social media:

Link to this page

HTML: To link to this page, just copy and paste the link below into your blog, web page or email.

<a href="https://numbermatics.com/n/21285/?utm_source=shared">Number 21285 - Facts about the integer</a>

BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:

[url=https://numbermatics.com/n/21285/?utm_source=shared]Number 21285 - Facts about the integer[/url]

Cite this page

MLA style:
"Number 21285 - Facts about the integer". Numbermatics.com. 2024. Web. 20 April 2024.

APA style:
Numbermatics. (2024). Number 21285 - Facts about the integer. Retrieved 20 April 2024, from https://numbermatics.com/n/21285/

Chicago style:
Numbermatics. 2024. "Number 21285 - Facts about the integer". https://numbermatics.com/n/21285/

The information we have on file for 21285 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

Keywords: Divisors of 21285, math, Factors of 21285, curriculum, school, college, exams, university, Prime factorization of 21285, STEM, science, technology, engineering, physics, economics, calculator, twenty-one thousand, two hundred eighty-five.