16323121 has 4 divisors (see below), whose sum is σ = 16355700. Its totient is φ = 16290544.

The previous prime is 16323119. The next prime is 16323137. The reversal of 16323121 is 12132361.

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 13395600 + 2927521 = 3660^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 16323121 - 2¹ = 16323119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16323161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15526 + ... + 16543.

It is an arithmetic number, because the mean of its divisors is an integer number (4088925).

Almost surely, 2^16323121 is an apocalyptic number.

It is an amenable number.

16323121 is a deficient number, since it is larger than the sum of its proper divisors (32579).

16323121 is an equidigital number, since it uses as much as digits as its factorization.

16323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32578.

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

The square root of 16323121 is about 4040.1882381889. The cubic root of 16323121 is about 253.6691965292.

Adding to 16323121 its reverse (12132361), we get a palindrome (28455482).

It can be divided in two parts, 1632 and 3121, that added together give a triangular number (4753 = T₉₇).

The spelling of 16323121 in words is "sixteen million, three hundred twenty-three thousand, one hundred twenty-one".