821234579892 has 12 divisors (see below), whose sum is σ = 1916214019776. Its totient is φ = 273744859960.

The previous prime is 821234579887. The next prime is 821234579911. The reversal of 821234579892 is 298975432128.

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

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34218107484 + ... + 34218107507.

It is an arithmetic number, because the mean of its divisors is an integer number (159684501648).

Almost surely, 2^821234579892 is an apocalyptic number.

It is an amenable number.

821234579892 is an abundant number, since it is smaller than the sum of its proper divisors (1094979439884).

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

821234579892 is a wasteful number, since it uses less digits than its factorization.

821234579892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68436214998 (or 68436214996 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 60.

The spelling of 821234579892 in words is "eight hundred twenty-one billion, two hundred thirty-four million, five hundred seventy-nine thousand, eight hundred ninety-two".