16321111 has 4 divisors (see below), whose sum is σ = 16597800. Its totient is φ = 16044424.

The previous prime is 16321103. The next prime is 16321127. The reversal of 16321111 is 11112361.

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

It is a cyclic number.

It is not a de Polignac number, because 16321111 - 2³ = 16321103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16321211) 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, 138256 + ... + 138373.

It is an arithmetic number, because the mean of its divisors is an integer number (4149450).

Almost surely, 2^16321111 is an apocalyptic number.

16321111 is a deficient number, since it is larger than the sum of its proper divisors (276689).

16321111 is an equidigital number, since it uses as much as digits as its factorization.

16321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276688.

The product of its digits is 36, while the sum is 16.

The square root of 16321111 is about 4039.9394797447. The cubic root of 16321111 is about 253.6587839777.

Adding to 16321111 its reverse (11112361), we get a palindrome (27433472).

The spelling of 16321111 in words is "sixteen million, three hundred twenty-one thousand, one hundred eleven".