12402321 has 4 divisors (see below), whose sum is σ = 16536432. Its totient is φ = 8268212.

The previous prime is 12402311. The next prime is 12402349. The reversal of 12402321 is 12320421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12320421 = 3 ⋅4106807.

It is a cyclic number.

It is not a de Polignac number, because 12402321 - 2¹⁹ = 11878033 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12402321.

It is not an unprimeable number, because it can be changed into a prime (12402311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067051 + ... + 2067056.

It is an arithmetic number, because the mean of its divisors is an integer number (4134108).

Almost surely, 2^12402321 is an apocalyptic number.

It is an amenable number.

12402321 is a deficient number, since it is larger than the sum of its proper divisors (4134111).

12402321 is an equidigital number, since it uses as much as digits as its factorization.

12402321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134110.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12402321 is about 3521.6929167660. The cubic root of 12402321 is about 231.4733458452.

Adding to 12402321 its reverse (12320421), we get a palindrome (24722742).

The spelling of 12402321 in words is "twelve million, four hundred two thousand, three hundred twenty-one".