312012121 has 4 divisors (see below), whose sum is σ = 312757200. Its totient is φ = 311267044.

The previous prime is 312012079. The next prime is 312012139. The reversal of 312012121 is 121210213.

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 312012121 - 2¹¹ = 312010073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312012161) 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, 371911 + ... + 372748.

It is an arithmetic number, because the mean of its divisors is an integer number (78189300).

Almost surely, 2^312012121 is an apocalyptic number.

It is an amenable number.

312012121 is a deficient number, since it is larger than the sum of its proper divisors (745079).

312012121 is an equidigital number, since it uses as much as digits as its factorization.

312012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745078.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 312012121 is about 17663.8648375716. The cubic root of 312012121 is about 678.2510715818.

Adding to 312012121 its reverse (121210213), we get a palindrome (433222334).

The spelling of 312012121 in words is "three hundred twelve million, twelve thousand, one hundred twenty-one".