321042321 has 12 divisors (see below), whose sum is σ = 464118772. Its totient is φ = 213847776.

The previous prime is 321042317. The next prime is 321042347. The reversal of 321042321 is 123240123.

It can be written as a sum of positive squares in 2 ways, for example, as 223921296 + 97121025 = 14964^2 + 9855^2 .

It is not a de Polignac number, because 321042321 - 2² = 321042317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321042294 and 321042303.

It is not an unprimeable number, because it can be changed into a prime (321042301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3286 + ... + 25551.

Almost surely, 2^321042321 is an apocalyptic number.

It is an amenable number.

321042321 is a deficient number, since it is larger than the sum of its proper divisors (143076451).

321042321 is a wasteful number, since it uses less digits than its factorization.

321042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30080 (or 30077 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 321042321 is about 17917.6538921813. The cubic root of 321042321 is about 684.7322170671.

Adding to 321042321 its reverse (123240123), we get a palindrome (444282444).

The spelling of 321042321 in words is "three hundred twenty-one million, forty-two thousand, three hundred twenty-one".