31213210233 has 16 divisors (see below), whose sum is σ = 42218668800. Its totient is φ = 20509207680.

The previous prime is 31213210211. The next prime is 31213210253. The reversal of 31213210233 is 33201231213.

It is a de Polignac number, because none of the positive numbers 2^k-31213210233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31213210253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19123 + ... + 250583.

It is an arithmetic number, because the mean of its divisors is an integer number (2638666800).

Almost surely, 2^31213210233 is an apocalyptic number.

It is an amenable number.

31213210233 is a deficient number, since it is larger than the sum of its proper divisors (11005458567).

31213210233 is a wasteful number, since it uses less digits than its factorization.

31213210233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232112.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31213210233 its reverse (33201231213), we get a palindrome (64414441446).

The spelling of 31213210233 in words is "thirty-one billion, two hundred thirteen million, two hundred ten thousand, two hundred thirty-three".