16521100044 has 24 divisors (see below), whose sum is σ = 38744920368. Its totient is φ = 5479078080.

The previous prime is 16521100033. The next prime is 16521100111. The reversal of 16521100044 is 44000112561.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16521099987 and 16521100023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3491947 + ... + 3496674.

It is an arithmetic number, because the mean of its divisors is an integer number (1614371682).

Almost surely, 2^16521100044 is an apocalyptic number.

It is an amenable number.

16521100044 is an abundant number, since it is smaller than the sum of its proper divisors (22223820324).

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

16521100044 is a wasteful number, since it uses less digits than its factorization.

16521100044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6988825 (or 6988823 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The spelling of 16521100044 in words is "sixteen billion, five hundred twenty-one million, one hundred thousand, forty-four".