312321211 has 2 divisors, whose sum is σ = 312321212. Its totient is φ = 312321210.

The previous prime is 312321197. The next prime is 312321223. The reversal of 312321211 is 112123213.

It is a strong prime.

It is an emirp because it is prime and its reverse (112123213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312321211 is a prime.

It is not a weakly prime, because it can be changed into another prime (312321011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156160605 + 156160606.

It is an arithmetic number, because the mean of its divisors is an integer number (156160606).

Almost surely, 2^312321211 is an apocalyptic number.

312321211 is a deficient number, since it is larger than the sum of its proper divisors (1).

312321211 is an equidigital number, since it uses as much as digits as its factorization.

312321211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 312321211 is about 17672.6118895878. The cubic root of 312321211 is about 678.4749639906.

Adding to 312321211 its reverse (112123213), we get a palindrome (424444424).

The spelling of 312321211 in words is "three hundred twelve million, three hundred twenty-one thousand, two hundred eleven".