16730321 has 4 divisors (see below), whose sum is σ = 16763700. Its totient is φ = 16696944.

The previous prime is 16730299. The next prime is 16730323. The reversal of 16730321 is 12303761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12303761 = 61 ⋅201701.

It can be written as a sum of positive squares in 2 ways, for example, as 11730625 + 4999696 = 3425^2 + 2236^2 .

It is a cyclic number.

It is not a de Polignac number, because 16730321 - 2⁶ = 16730257 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (16730323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15926 + ... + 16943.

It is an arithmetic number, because the mean of its divisors is an integer number (4190925).

Almost surely, 2^16730321 is an apocalyptic number.

It is an amenable number.

16730321 is a deficient number, since it is larger than the sum of its proper divisors (33379).

16730321 is an equidigital number, since it uses as much as digits as its factorization.

16730321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33378.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 16730321 is about 4090.2715068807. The cubic root of 16730321 is about 255.7612571158.

The spelling of 16730321 in words is "sixteen million, seven hundred thirty thousand, three hundred twenty-one".