312323665221 has 6 divisors (see below), whose sum is σ = 451134183110. Its totient is φ = 208215776808.

The previous prime is 312323665133. The next prime is 312323665223. The reversal of 312323665221 is 122566323213.

312323665221 is a `hidden beast` number, since 3 + 123 + 2 + 3 + 6 + 6 + 522 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 236210580225 + 76113084996 = 486015^2 + 275886^2 .

It is not a de Polignac number, because 312323665221 - 2¹¹ = 312323663173 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 (312323665223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17351314726 + ... + 17351314743.

Almost surely, 2^312323665221 is an apocalyptic number.

It is an amenable number.

312323665221 is a deficient number, since it is larger than the sum of its proper divisors (138810517889).

312323665221 is a wasteful number, since it uses less digits than its factorization.

312323665221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34702629475 (or 34702629472 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

Adding to 312323665221 its reverse (122566323213), we get a palindrome (434889988434).

The spelling of 312323665221 in words is "three hundred twelve billion, three hundred twenty-three million, six hundred sixty-five thousand, two hundred twenty-one".