31212133023 has 4 divisors (see below), whose sum is σ = 41616177368. Its totient is φ = 20808088680.

The previous prime is 31212132961. The next prime is 31212133081. The reversal of 31212133023 is 32033121213.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-31212133023 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 (31212133223) 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 3 ways as a sum of consecutive naturals, for example, 5202022168 + ... + 5202022173.

It is an arithmetic number, because the mean of its divisors is an integer number (10404044342).

Almost surely, 2^31212133023 is an apocalyptic number.

31212133023 is a deficient number, since it is larger than the sum of its proper divisors (10404044345).

31212133023 is a wasteful number, since it uses less digits than its factorization.

31212133023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404044344.

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

Adding to 31212133023 its reverse (32033121213), we get a palindrome (63245254236).

The spelling of 31212133023 in words is "thirty-one billion, two hundred twelve million, one hundred thirty-three thousand, twenty-three".