16240321 has 4 divisors (see below), whose sum is σ = 17195652. Its totient is φ = 15284992.

The previous prime is 16240303. The next prime is 16240339. The reversal of 16240321 is 12304261.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (16240303) and next prime (16240339).

It can be written as a sum of positive squares in 2 ways, for example, as 15054400 + 1185921 = 3880^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 16240321 - 2¹¹ = 16238273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16240381) 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, 477640 + ... + 477673.

It is an arithmetic number, because the mean of its divisors is an integer number (4298913).

Almost surely, 2^16240321 is an apocalyptic number.

It is an amenable number.

16240321 is a deficient number, since it is larger than the sum of its proper divisors (955331).

16240321 is an equidigital number, since it uses as much as digits as its factorization.

16240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955330.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 16240321 is about 4029.9281631314. The cubic root of 16240321 is about 253.2395518909.

Adding to 16240321 its reverse (12304261), we get a palindrome (28544582).

It can be divided in two parts, 16240 and 321, that added together give a palindrome (16561).

The spelling of 16240321 in words is "sixteen million, two hundred forty thousand, three hundred twenty-one".