16204121 has 4 divisors (see below), whose sum is σ = 16908672. Its totient is φ = 15499572.

The previous prime is 16204099. The next prime is 16204129. The reversal of 16204121 is 12140261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16204121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16204121.

It is not an unprimeable number, because it can be changed into a prime (16204129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352241 + ... + 352286.

It is an arithmetic number, because the mean of its divisors is an integer number (4227168).

Almost surely, 2^16204121 is an apocalyptic number.

It is an amenable number.

16204121 is a deficient number, since it is larger than the sum of its proper divisors (704551).

16204121 is an equidigital number, since it uses as much as digits as its factorization.

16204121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704550.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 16204121 is about 4025.4342622877. The cubic root of 16204121 is about 253.0512532407.

Adding to 16204121 its reverse (12140261), we get a palindrome (28344382).

The spelling of 16204121 in words is "sixteen million, two hundred four thousand, one hundred twenty-one".