313211321 has 4 divisors (see below), whose sum is σ = 323314944. Its totient is φ = 303107700.

The previous prime is 313211303. The next prime is 313211323. The reversal of 313211321 is 123112313.

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.

It is a cyclic number.

It is not a de Polignac number, because 313211321 - 2¹⁸ = 312949177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 313211321.

It is not an unprimeable number, because it can be changed into a prime (313211323) 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, 5051765 + ... + 5051826.

It is an arithmetic number, because the mean of its divisors is an integer number (80828736).

Almost surely, 2^313211321 is an apocalyptic number.

313211321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

313211321 is a deficient number, since it is larger than the sum of its proper divisors (10103623).

313211321 is a wasteful number, since it uses less digits than its factorization.

313211321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10103622.

The product of its digits is 108, while the sum is 17.

The square root of 313211321 is about 17697.7772898181. Note that the first 3 decimals coincide. The cubic root of 313211321 is about 679.1188999105.

Adding to 313211321 its reverse (123112313), we get a palindrome (436323634).

The spelling of 313211321 in words is "three hundred thirteen million, two hundred eleven thousand, three hundred twenty-one".