311400021 has 4 divisors (see below), whose sum is σ = 415200032. Its totient is φ = 207600012.

The previous prime is 311400007. The next prime is 311400071. The reversal of 311400021 is 120004113.

It is a happy number.

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 not a de Polignac number, because 311400021 - 2⁹ = 311399509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311400071) 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, 51900001 + ... + 51900006.

It is an arithmetic number, because the mean of its divisors is an integer number (103800008).

Almost surely, 2^311400021 is an apocalyptic number.

It is an amenable number.

311400021 is a deficient number, since it is larger than the sum of its proper divisors (103800011).

311400021 is a wasteful number, since it uses less digits than its factorization.

311400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103800010.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 311400021 is about 17646.5299988411. The cubic root of 311400021 is about 677.8072541442.

Adding to 311400021 its reverse (120004113), we get a palindrome (431404134).

The spelling of 311400021 in words is "three hundred eleven million, four hundred thousand, twenty-one".