31218233281213 has 8 divisors (see below), whose sum is σ = 34281792599616. Its totient is φ = 28192263648000.

The previous prime is 31218233281139. The next prime is 31218233281267.

31218233281213 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31218233281213 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 (31218233221213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9397419556 + ... + 9397422877.

It is an arithmetic number, because the mean of its divisors is an integer number (4285224074952).

Almost surely, 2^{31218233281213} is an apocalyptic number.

It is an amenable number.

31218233281213 is a deficient number, since it is larger than the sum of its proper divisors (3063559318403).

31218233281213 is a wasteful number, since it uses less digits than its factorization.

31218233281213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18794842595.

The product of its digits is 82944, while the sum is 40.

The spelling of 31218233281213 in words is "thirty-one trillion, two hundred eighteen billion, two hundred thirty-three million, two hundred eighty-one thousand, two hundred thirteen".