312310221 has 16 divisors (see below), whose sum is σ = 421581888. Its totient is φ = 205632000.

The previous prime is 312310217. The next prime is 312310231. The reversal of 312310221 is 122013213.

It is not a de Polignac number, because 312310221 - 2² = 312310217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312310221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312310211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203226 + ... + 204756.

It is an arithmetic number, because the mean of its divisors is an integer number (26348868).

Almost surely, 2^312310221 is an apocalyptic number.

It is an amenable number.

312310221 is a deficient number, since it is larger than the sum of its proper divisors (109271667).

312310221 is a wasteful number, since it uses less digits than its factorization.

312310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 312310221 is about 17672.3009537525. The cubic root of 312310221 is about 678.4670058084.

Adding to 312310221 its reverse (122013213), we get a palindrome (434323434).

The spelling of 312310221 in words is "three hundred twelve million, three hundred ten thousand, two hundred twenty-one".