16521214464325 has 24 divisors (see below), whose sum is σ = 21175617102336. Its totient is φ = 12773402376000.

The previous prime is 16521214464323. The next prime is 16521214464331. The reversal of 16521214464325 is 52346441212561.

It is not a de Polignac number, because 16521214464325 - 2¹ = 16521214464323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521214464323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13769866 + ... + 14921515.

It is an arithmetic number, because the mean of its divisors is an integer number (882317379264).

Almost surely, 2^{16521214464325} is an apocalyptic number.

It is an amenable number.

16521214464325 is a deficient number, since it is larger than the sum of its proper divisors (4654402638011).

16521214464325 is a wasteful number, since it uses less digits than its factorization.

16521214464325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28692165 (or 28692160 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 46.

Adding to 16521214464325 its reverse (52346441212561), we get a palindrome (68867655676886).

The spelling of 16521214464325 in words is "sixteen trillion, five hundred twenty-one billion, two hundred fourteen million, four hundred sixty-four thousand, three hundred twenty-five".