16072321 has 4 divisors (see below), whose sum is σ = 16095700. Its totient is φ = 16048944.

The previous prime is 16072307. The next prime is 16072333. The reversal of 16072321 is 12327061.

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 9641025 + 6431296 = 3105^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 16072321 - 2¹¹ = 16070273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16072292 and 16072301.

It is not an unprimeable number, because it can be changed into a prime (16079321) 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, 10626 + ... + 12043.

It is an arithmetic number, because the mean of its divisors is an integer number (4023925).

Almost surely, 2^16072321 is an apocalyptic number.

It is an amenable number.

16072321 is a deficient number, since it is larger than the sum of its proper divisors (23379).

16072321 is an equidigital number, since it uses as much as digits as its factorization.

16072321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23378.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 16072321 is about 4009.0299325398. The cubic root of 16072321 is about 252.3633008393.

Adding to 16072321 its reverse (12327061), we get a palindrome (28399382).

The spelling of 16072321 in words is "sixteen million, seventy-two thousand, three hundred twenty-one".