312130321 has 4 divisors (see below), whose sum is σ = 312174144. Its totient is φ = 312086500.

The previous prime is 312130283. The next prime is 312130327. The reversal of 312130321 is 123031213.

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 312130321 - 2⁷ = 312130193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312130295 and 312130304.

It is not an unprimeable number, because it can be changed into a prime (312130327) 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, 8485 + ... + 26386.

It is an arithmetic number, because the mean of its divisors is an integer number (78043536).

Almost surely, 2^312130321 is an apocalyptic number.

It is an amenable number.

312130321 is a deficient number, since it is larger than the sum of its proper divisors (43823).

312130321 is an equidigital number, since it uses as much as digits as its factorization.

312130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43822.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 312130321 is about 17667.2103344020. The cubic root of 312130321 is about 678.3367083780.

Adding to 312130321 its reverse (123031213), we get a palindrome (435161534).

The spelling of 312130321 in words is "three hundred twelve million, one hundred thirty thousand, three hundred twenty-one".