16521223606044 has 24 divisors (see below), whose sum is σ = 40225587911040. Its totient is φ = 5267636511984.

The previous prime is 16521223606037. The next prime is 16521223606061. The reversal of 16521223606044 is 44060632212561.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 16521223605987 and 16521223606005.

It is a congruent number.

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, 29929752634 + ... + 29929753185.

It is an arithmetic number, because the mean of its divisors is an integer number (1676066162960).

Almost surely, 2^{16521223606044} is an apocalyptic number.

It is an amenable number.

16521223606044 is an abundant number, since it is smaller than the sum of its proper divisors (23704364304996).

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

16521223606044 is a wasteful number, since it uses less digits than its factorization.

16521223606044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59859505849 (or 59859505847 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 16521223606044 in words is "sixteen trillion, five hundred twenty-one billion, two hundred twenty-three million, six hundred six thousand, forty-four".