It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a congruent number.
It is an unprimeable number.
221358 is an apocalyptic number.
21358 is a wasteful number, since it uses less digits than its factorization.
21358 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 242.
The square root of 21358 is about 146.1437648345. The cubic root of 21358 is about 27.7451361765.
The spelling of 21358 in words is "twenty-one thousand, three hundred fifty-eight".