16521337904 has 20 divisors (see below), whose sum is σ = 33042676800. Its totient is φ = 7994195520.

The previous prime is 16521337879. The next prime is 16521337907. The reversal of 16521337904 is 40973312561.

16521337904 is an admirable number.

It is a super-2 number, since 2×16521337904² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16521337907) 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, 16654079 + ... + 16655070.

It is an arithmetic number, because the mean of its divisors is an integer number (1652133840).

Almost surely, 2^16521337904 is an apocalyptic number.

It is an amenable number.

16521337904 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16521337904 is a wasteful number, since it uses less digits than its factorization.

16521337904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33309188 (or 33309182 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 16521337904 in words is "sixteen billion, five hundred twenty-one million, three hundred thirty-seven thousand, nine hundred four".