312042121 has 4 divisors (see below), whose sum is σ = 312306192. Its totient is φ = 311778052.

The previous prime is 312042109. The next prime is 312042139. The reversal of 312042121 is 121240213.

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 312042121 - 2⁷ = 312041993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312042095 and 312042104.

It is not an unprimeable number, because it can be changed into a prime (312042151) 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, 130255 + ... + 132628.

It is an arithmetic number, because the mean of its divisors is an integer number (78076548).

Almost surely, 2^312042121 is an apocalyptic number.

It is an amenable number.

312042121 is a deficient number, since it is larger than the sum of its proper divisors (264071).

312042121 is a wasteful number, since it uses less digits than its factorization.

312042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264070.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 312042121 is about 17664.7140084407. The cubic root of 312042121 is about 678.2728088570.

Adding to 312042121 its reverse (121240213), we get a palindrome (433282334).

The spelling of 312042121 in words is "three hundred twelve million, forty-two thousand, one hundred twenty-one".