16104821 has 4 divisors (see below), whose sum is σ = 16116000. Its totient is φ = 16093644.

The previous prime is 16104791. The next prime is 16104827. The reversal of 16104821 is 12840161.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12840161 = 1453 ⋅8837.

It is a cyclic number.

It is not a de Polignac number, because 16104821 - 2¹⁰ = 16103797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16104827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3041 + ... + 6438.

It is an arithmetic number, because the mean of its divisors is an integer number (4029000).

Almost surely, 2^16104821 is an apocalyptic number.

It is an amenable number.

16104821 is a deficient number, since it is larger than the sum of its proper divisors (11179).

16104821 is an equidigital number, since it uses as much as digits as its factorization.

16104821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11178.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 16104821 is about 4013.0812351608. The cubic root of 16104821 is about 252.5332884256.

Adding to 16104821 its reverse (12840161), we get a palindrome (28944982).

The spelling of 16104821 in words is "sixteen million, one hundred four thousand, eight hundred twenty-one".