21428
21,428 is an even composite number composed of three prime numbers multiplied together.
21428 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.
Prime factorization of 21428:
22 × 11 × 487
(2 × 2 × 11 × 487)See below for interesting mathematical facts about the number 21428 from the Numbermatics database.
Names of 21428
- Cardinal: 21428 can be written as Twenty-one thousand, four hundred twenty-eight.
Scientific notation
- Scientific notation: 2.1428 × 104
Factors of 21428
Divisors of 21428
Bases of 21428
- Binary: 1010011101101002
- Hexadecimal: 0x53B4
- Base-36: GJ8
Squares and roots of 21428
- 21428 squared (214282) is 459159184
- 21428 cubed (214283) is 9838862994752
-
The
square root of 21428 is 146.3830591291 -
The
cube root of 21428 is 27.7754143175
Scales and comparisons
How big is 21428?- 21,428 seconds is equal to 5 hours, 57 minutes, 8 seconds.
-
To count from 1 to 21,428 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 21428 cubic inches would be around 2.3 feet tall.
Recreational maths with 21428
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