16369921 has 4 divisors (see below), whose sum is σ = 16384000. Its totient is φ = 16355844.

The previous prime is 16369907. The next prime is 16369931. The reversal of 16369921 is 12996361.

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 not a de Polignac number, because 16369921 - 2⁵ = 16369889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16369901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5121 + ... + 7678.

It is an arithmetic number, because the mean of its divisors is an integer number (4096000).

Almost surely, 2^16369921 is an apocalyptic number.

It is an amenable number.

16369921 is a deficient number, since it is larger than the sum of its proper divisors (14079).

16369921 is a wasteful number, since it uses less digits than its factorization.

16369921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14078.

The product of its digits is 17496, while the sum is 37.

The square root of 16369921 is about 4045.9759020538. The cubic root of 16369921 is about 253.9113967522.

The spelling of 16369921 in words is "sixteen million, three hundred sixty-nine thousand, nine hundred twenty-one".