16132321 has 4 divisors (see below), whose sum is σ = 16159252. Its totient is φ = 16105392.

The previous prime is 16132313. The next prime is 16132331. The reversal of 16132321 is 12323161.

16132321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3629025 + 12503296 = 1905^2 + 3536^2 .

It is a cyclic number.

It is not a de Polignac number, because 16132321 - 2³ = 16132313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16132331) 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, 12546 + ... + 13771.

It is an arithmetic number, because the mean of its divisors is an integer number (4039813).

It is a Poulet number, since it divides 2^16132320-1.

Almost surely, 2^16132321 is an apocalyptic number.

It is an amenable number.

16132321 is a deficient number, since it is larger than the sum of its proper divisors (26931).

16132321 is an equidigital number, since it uses as much as digits as its factorization.

16132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26930.

The product of its digits is 216, while the sum is 19.

The square root of 16132321 is about 4016.5060687120. The cubic root of 16132321 is about 252.6769455405.

Adding to 16132321 its reverse (12323161), we get a palindrome (28455482).

The spelling of 16132321 in words is "sixteen million, one hundred thirty-two thousand, three hundred twenty-one".