21420
21,420 is an even composite number composed of five prime numbers multiplied together.
21420 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of seventy-two divisors.
Prime factorization of 21420:
22 × 32 × 5 × 7 × 17
(2 × 2 × 3 × 3 × 5 × 7 × 17)See below for interesting mathematical facts about the number 21420 from the Numbermatics database.
Names of 21420
- Cardinal: 21420 can be written as Twenty-one thousand, four hundred twenty.
Scientific notation
- Scientific notation: 2.142 × 104
Factors of 21420
Divisors of 21420
Bases of 21420
- Binary: 1010011101011002
- Hexadecimal: 0x53AC
- Base-36: GJ0
Squares and roots of 21420
- 21420 squared (214202) is 458816400
- 21420 cubed (214203) is 9827847288000
-
The
square root of 21420 is 146.3557310119 -
The
cube root of 21420 is 27.7719572989
Scales and comparisons
How big is 21420?- 21,420 seconds is equal to 5 hours, 57 minutes.
-
To count from 1 to 21,420 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 21420 cubic inches would be around 2.3 feet tall.
Recreational maths with 21420
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