311330312021 has 4 divisors (see below), whose sum is σ = 321373225344. Its totient is φ = 301287398700.

The previous prime is 311330311993. The next prime is 311330312023. The reversal of 311330312021 is 120213033113.

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 a de Polignac number, because none of the positive numbers 2^k-311330312021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311330311984 and 311330312002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311330312023) 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, 5021456615 + ... + 5021456676.

It is an arithmetic number, because the mean of its divisors is an integer number (80343306336).

Almost surely, 2^311330312021 is an apocalyptic number.

311330312021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

311330312021 is a deficient number, since it is larger than the sum of its proper divisors (10042913323).

311330312021 is a wasteful number, since it uses less digits than its factorization.

311330312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10042913322.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 311330312021 its reverse (120213033113), we get a palindrome (431543345134).

The spelling of 311330312021 in words is "three hundred eleven billion, three hundred thirty million, three hundred twelve thousand, twenty-one".