312330021 has 4 divisors (see below), whose sum is σ = 416440032. Its totient is φ = 208220012.

The previous prime is 312330013. The next prime is 312330047. The reversal of 312330021 is 120033213.

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 312330021 - 2³ = 312330013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312335021) 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, 52055001 + ... + 52055006.

It is an arithmetic number, because the mean of its divisors is an integer number (104110008).

Almost surely, 2^312330021 is an apocalyptic number.

It is an amenable number.

312330021 is a deficient number, since it is larger than the sum of its proper divisors (104110011).

312330021 is a wasteful number, since it uses less digits than its factorization.

312330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104110010.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 312330021 is about 17672.8611435727. The cubic root of 312330021 is about 678.4813434359.

Adding to 312330021 its reverse (120033213), we get a palindrome (432363234).

The spelling of 312330021 in words is "three hundred twelve million, three hundred thirty thousand, twenty-one".