312112222021 has 4 divisors (see below), whose sum is σ = 312118702272. Its totient is φ = 312105741772.

The previous prime is 312112222013. The next prime is 312112222027. The reversal of 312112222021 is 120222211213.

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 not a de Polignac number, because 312112222021 - 2³ = 312112222013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312112222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312112222027) 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 3 ways as a sum of consecutive naturals, for example, 3167335 + ... + 3264388.

It is an arithmetic number, because the mean of its divisors is an integer number (78029675568).

Almost surely, 2^312112222021 is an apocalyptic number.

It is an amenable number.

312112222021 is a deficient number, since it is larger than the sum of its proper divisors (6480251).

312112222021 is an equidigital number, since it uses as much as digits as its factorization.

312112222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6480250.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 312112222021 its reverse (120222211213), we get a palindrome (432334433234).

The spelling of 312112222021 in words is "three hundred twelve billion, one hundred twelve million, two hundred twenty-two thousand, twenty-one".