31821130812 has 12 divisors (see below), whose sum is σ = 74249305256. Its totient is φ = 10607043600.

The previous prime is 31821130807. The next prime is 31821130823. The reversal of 31821130812 is 21803112813.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31821130812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325880439 + ... + 1325880462.

Almost surely, 2^31821130812 is an apocalyptic number.

It is an amenable number.

31821130812 is an abundant number, since it is smaller than the sum of its proper divisors (42428174444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31821130812 is a wasteful number, since it uses less digits than its factorization.

31821130812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651760908 (or 2651760906 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The spelling of 31821130812 in words is "thirty-one billion, eight hundred twenty-one million, one hundred thirty thousand, eight hundred twelve".