312211213 has 4 divisors (see below), whose sum is σ = 312249600. Its totient is φ = 312172828.

The previous prime is 312211183. The next prime is 312211247. The reversal of 312211213 is 312112213.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312211213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312211253) 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 3 ways as a sum of consecutive naturals, for example, 1645 + ... + 25042.

It is an arithmetic number, because the mean of its divisors is an integer number (78062400).

Almost surely, 2^312211213 is an apocalyptic number.

It is an amenable number.

312211213 is a deficient number, since it is larger than the sum of its proper divisors (38387).

312211213 is a wasteful number, since it uses less digits than its factorization.

312211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38386.

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

The square root of 312211213 is about 17669.4995118707. The cubic root of 312211213 is about 678.3953027853.

Adding to 312211213 its reverse (312112213), we get a palindrome (624323426).

The spelling of 312211213 in words is "three hundred twelve million, two hundred eleven thousand, two hundred thirteen".