321012321 has 16 divisors (see below), whose sum is σ = 493494144. Its totient is φ = 181810944.

The previous prime is 321012287. The next prime is 321012337. The reversal of 321012321 is 123210123.

321012321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 321012321 - 2⁶ = 321012257 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 321012321.

It is not an unprimeable number, because it can be changed into a prime (321012121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65266 + ... + 70011.

It is an arithmetic number, because the mean of its divisors is an integer number (30843384).

Almost surely, 2^321012321 is an apocalyptic number.

It is an amenable number.

321012321 is a deficient number, since it is larger than the sum of its proper divisors (172481823).

321012321 is a wasteful number, since it uses less digits than its factorization.

321012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135400.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 321012321 is about 17916.8167094493. The cubic root of 321012321 is about 684.7108879929.

Adding to 321012321 its reverse (123210123), we get a palindrome (444222444).

The spelling of 321012321 in words is "three hundred twenty-one million, twelve thousand, three hundred twenty-one".