311112021 has 32 divisors (see below), whose sum is σ = 471817728. Its totient is φ = 180671040.

The previous prime is 311112013. The next prime is 311112041. The reversal of 311112021 is 120211113.

It is not a de Polignac number, because 311112021 - 2³ = 311112013 is a prime.

It is a super-2 number, since 2×311112021² = 193581379221408882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311111988 and 311112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311112041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79906 + ... + 83708.

It is an arithmetic number, because the mean of its divisors is an integer number (14744304).

Almost surely, 2^311112021 is an apocalyptic number.

It is an amenable number.

311112021 is a deficient number, since it is larger than the sum of its proper divisors (160705707).

311112021 is a wasteful number, since it uses less digits than its factorization.

311112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 311112021 is about 17638.3678666707. The cubic root of 311112021 is about 677.5982317862.

Adding to 311112021 its reverse (120211113), we get a palindrome (431323134).

The spelling of 311112021 in words is "three hundred eleven million, one hundred twelve thousand, twenty-one".