311213231321 has 4 divisors (see below), whose sum is σ = 311214556644. Its totient is φ = 311211906000.

The previous prime is 311213231309. The next prime is 311213231323. The reversal of 311213231321 is 123132312113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106185391321 + 205027840000 = 325861^2 + 452800^2 .

It is a cyclic number.

It is not a de Polignac number, because 311213231321 - 2³⁰ = 310139489497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311213231323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205130 + ... + 815171.

It is an arithmetic number, because the mean of its divisors is an integer number (77803639161).

Almost surely, 2^311213231321 is an apocalyptic number.

It is an amenable number.

311213231321 is a deficient number, since it is larger than the sum of its proper divisors (1325323).

311213231321 is a wasteful number, since it uses less digits than its factorization.

311213231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325322.

The product of its digits is 648, while the sum is 23.

Adding to 311213231321 its reverse (123132312113), we get a palindrome (434345543434).

The spelling of 311213231321 in words is "three hundred eleven billion, two hundred thirteen million, two hundred thirty-one thousand, three hundred twenty-one".