16344521 has 4 divisors (see below), whose sum is σ = 16439172. Its totient is φ = 16249872.

The previous prime is 16344479. The next prime is 16344539. The reversal of 16344521 is 12544361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15366400 + 978121 = 3920^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 16344521 - 2¹⁸ = 16082377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16344551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47066 + ... + 47411.

It is an arithmetic number, because the mean of its divisors is an integer number (4109793).

Almost surely, 2^16344521 is an apocalyptic number.

It is an amenable number.

16344521 is a deficient number, since it is larger than the sum of its proper divisors (94651).

16344521 is an equidigital number, since it uses as much as digits as its factorization.

16344521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94650.

The product of its digits is 2880, while the sum is 26.

The square root of 16344521 is about 4042.8357621848. The cubic root of 16344521 is about 253.7800035704.

Adding to 16344521 its reverse (12544361), we get a palindrome (28888882).

The spelling of 16344521 in words is "sixteen million, three hundred forty-four thousand, five hundred twenty-one".