311323203231021 has 48 divisors (see below), whose sum is σ = 482970372917760. Its totient is φ = 192798655695360.

The previous prime is 311323203231011. The next prime is 311323203231049. The reversal of 311323203231021 is 120132302323113.

311323203231021 is a `hidden beast` number, since 3 + 1 + 1 + 3 + 2 + 320 + 3 + 2 + 310 + 21 = 666.

It is not a de Polignac number, because 311323203231021 - 2³⁹ = 310773447417133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311323203231011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155049036 + ... + 157044101.

It is an arithmetic number, because the mean of its divisors is an integer number (10061882769120).

Almost surely, 2^{311323203231021} is an apocalyptic number.

It is an amenable number.

311323203231021 is a deficient number, since it is larger than the sum of its proper divisors (171647169686739).

311323203231021 is a wasteful number, since it uses less digits than its factorization.

311323203231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312093306 (or 312093303 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 311323203231021 its reverse (120132302323113), we get a palindrome (431455505554134).

The spelling of 311323203231021 in words is "three hundred eleven trillion, three hundred twenty-three billion, two hundred three million, two hundred thirty-one thousand, twenty-one".