311123312021 has 16 divisors (see below), whose sum is σ = 328455600000. Its totient is φ = 293887642176.

The previous prime is 311123312011. The next prime is 311123312047. The reversal of 311123312021 is 120213321113.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 311123312021 - 2¹⁰ = 311123310997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311123311984 and 311123312002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311123312011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13909955 + ... + 13932303.

It is an arithmetic number, because the mean of its divisors is an integer number (20528475000).

Almost surely, 2^311123312021 is an apocalyptic number.

It is an amenable number.

311123312021 is a deficient number, since it is larger than the sum of its proper divisors (17332287979).

311123312021 is a wasteful number, since it uses less digits than its factorization.

311123312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24476.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 311123312021 its reverse (120213321113), we get a palindrome (431336633134).

The spelling of 311123312021 in words is "three hundred eleven billion, one hundred twenty-three million, three hundred twelve thousand, twenty-one".