12078321 has 4 divisors (see below), whose sum is σ = 16104432. Its totient is φ = 8052212.

The previous prime is 12078299. The next prime is 12078323. The reversal of 12078321 is 12387021.

12078321 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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: 12387021 = 3 ⋅4129007.

It is a cyclic number.

It is not a de Polignac number, because 12078321 - 2⁷ = 12078193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12078291 and 12078300.

It is not an unprimeable number, because it can be changed into a prime (12078323) 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, 2013051 + ... + 2013056.

It is an arithmetic number, because the mean of its divisors is an integer number (4026108).

Almost surely, 2^12078321 is an apocalyptic number.

It is an amenable number.

12078321 is a deficient number, since it is larger than the sum of its proper divisors (4026111).

12078321 is an equidigital number, since it uses as much as digits as its factorization.

12078321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026110.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12078321 is about 3475.3878920201. The cubic root of 12078321 is about 229.4398530446.

The spelling of 12078321 in words is "twelve million, seventy-eight thousand, three hundred twenty-one".