16221326 has 32 divisors (see below), whose sum is σ = 28235520. Its totient is φ = 6912000.

The previous prime is 16221323. The next prime is 16221379. The reversal of 16221326 is 62312261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221323) 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 15 ways as a sum of consecutive naturals, for example, 62990 + ... + 63246.

It is an arithmetic number, because the mean of its divisors is an integer number (882360).

Almost surely, 2^16221326 is an apocalyptic number.

16221326 is a deficient number, since it is larger than the sum of its proper divisors (12014194).

16221326 is a wasteful number, since it uses less digits than its factorization.

16221326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440.

The product of its digits is 864, while the sum is 23.

The square root of 16221326 is about 4027.5707318432. The cubic root of 16221326 is about 253.1407820470.

Adding to 16221326 its reverse (62312261), we get a palindrome (78533587).

The spelling of 16221326 in words is "sixteen million, two hundred twenty-one thousand, three hundred twenty-six".