312213221213 has 2 divisors, whose sum is σ = 312213221214. Its totient is φ = 312213221212.

The previous prime is 312213221209. The next prime is 312213221237. The reversal of 312213221213 is 312122312213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194469534169 + 117743687044 = 440987^2 + 343138^2 .

It is a cyclic number.

It is not a de Polignac number, because 312213221213 - 2² = 312213221209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312212221213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156106610606 + 156106610607.

It is an arithmetic number, because the mean of its divisors is an integer number (156106610607).

Almost surely, 2^312213221213 is an apocalyptic number.

It is an amenable number.

312213221213 is a deficient number, since it is larger than the sum of its proper divisors (1).

312213221213 is an equidigital number, since it uses as much as digits as its factorization.

312213221213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 312213221213 its reverse (312122312213), we get a palindrome (624335533426).

The spelling of 312213221213 in words is "three hundred twelve billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred thirteen".