821215480164 has 24 divisors (see below), whose sum is σ = 1916185235328. Its totient is φ = 273736238880.

The previous prime is 821215480159. The next prime is 821215480193. The reversal of 821215480164 is 461084512128.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1930774 + ... + 2317394.

It is an arithmetic number, because the mean of its divisors is an integer number (79841051472).

Almost surely, 2^821215480164 is an apocalyptic number.

It is an amenable number.

821215480164 is an abundant number, since it is smaller than the sum of its proper divisors (1094969755164).

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

821215480164 is a wasteful number, since it uses less digits than its factorization.

821215480164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563635 (or 563633 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 821215480164 in words is "eight hundred twenty-one billion, two hundred fifteen million, four hundred eighty thousand, one hundred sixty-four".