31211211213 has 192 divisors, whose sum is σ = 60550963200. Its totient is φ = 15032563200.

The previous prime is 31211211151. The next prime is 31211211221.

31211211213 is a `hidden beast` number, since 31 + 211 + 211 + 213 = 666.

31211211213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31211211213 - 2¹² = 31211207117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211211223) 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 191 ways as a sum of consecutive naturals, for example, 86939128 + ... + 86939486.

It is an arithmetic number, because the mean of its divisors is an integer number (315369600).

Almost surely, 2^31211211213 is an apocalyptic number.

It is an amenable number.

31211211213 is a deficient number, since it is larger than the sum of its proper divisors (29339751987).

31211211213 is a wasteful number, since it uses less digits than its factorization.

31211211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 589 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The spelling of 31211211213 in words is "thirty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred thirteen".