16044921 has 6 divisors (see below), whose sum is σ = 23176010. Its totient is φ = 10696608.

The previous prime is 16044913. The next prime is 16044947. The reversal of 16044921 is 12944061.

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 4410000 = 3411^2 + 2100^2 .

It is not a de Polignac number, because 16044921 - 2³ = 16044913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16044521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 891376 + ... + 891393.

Almost surely, 2^16044921 is an apocalyptic number.

It is an amenable number.

16044921 is a deficient number, since it is larger than the sum of its proper divisors (7131089).

16044921 is a wasteful number, since it uses less digits than its factorization.

16044921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782775 (or 1782772 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 16044921 is about 4005.6111893193. The cubic root of 16044921 is about 252.2198101018.

Adding to 16044921 its reverse (12944061), we get a palindrome (28988982).

The spelling of 16044921 in words is "sixteen million, forty-four thousand, nine hundred twenty-one".