It is a happy number.
The square root of 12321 is 111.
12321 is nontrivially palindromic in base 10.
12321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
12321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (9).
It is an alternating number because its digits alternate between odd and even.
12321 is a lucky number.
12321 is a Friedman number, since it can be written as (113-2)^2, using all its digits and the basic arithmetic operations.
212321 is an apocalyptic number.
12321 is the 111-st square number.
12321 is the 56-th centered octagonal number.
It is an amenable number.
12321 is an equidigital number, since it uses as much as digits as its factorization.
12321 is an evil number, because the sum of its binary digits is even.
The cubic root of 12321 is about 23.0966318809.
The spelling of 12321 in words is "twelve thousand, three hundred twenty-one", and thus it is an iban number.