16821319524 has 12 divisors (see below), whose sum is σ = 39249745584. Its totient is φ = 5607106504.

The previous prime is 16821319519. The next prime is 16821319547. The reversal of 16821319524 is 42591312861.

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

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 3 ways as a sum of consecutive naturals, for example, 700888302 + ... + 700888325.

It is an arithmetic number, because the mean of its divisors is an integer number (3270812132).

Almost surely, 2^16821319524 is an apocalyptic number.

It is an amenable number.

16821319524 is an abundant number, since it is smaller than the sum of its proper divisors (22428426060).

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

16821319524 is a wasteful number, since it uses less digits than its factorization.

16821319524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401776634 (or 1401776632 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The spelling of 16821319524 in words is "sixteen billion, eight hundred twenty-one million, three hundred nineteen thousand, five hundred twenty-four".