312013123021 has 4 divisors (see below), whose sum is σ = 317900163132. Its totient is φ = 306126082912.

The previous prime is 312013123001. The next prime is 312013123027. The reversal of 312013123021 is 120321310213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201381050025 + 110632072996 = 448755^2 + 332614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312013123021 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 312013123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312013123027) 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, 2943519976 + ... + 2943520081.

It is an arithmetic number, because the mean of its divisors is an integer number (79475040783).

Almost surely, 2^312013123021 is an apocalyptic number.

It is an amenable number.

312013123021 is a deficient number, since it is larger than the sum of its proper divisors (5887040111).

312013123021 is an equidigital number, since it uses as much as digits as its factorization.

312013123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5887040110.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 312013123021 its reverse (120321310213), we get a palindrome (432334433234).

The spelling of 312013123021 in words is "three hundred twelve billion, thirteen million, one hundred twenty-three thousand, twenty-one".