16221233 has 16 divisors (see below), whose sum is σ = 19719936. Its totient is φ = 13041600.

The previous prime is 16221223. The next prime is 16221239. The reversal of 16221233 is 33212261.

It is a happy number.

16221233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16221233 - 2⁴ = 16221217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16221239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7583 + ... + 9483.

It is an arithmetic number, because the mean of its divisors is an integer number (1232496).

Almost surely, 2^16221233 is an apocalyptic number.

It is an amenable number.

16221233 is a deficient number, since it is larger than the sum of its proper divisors (3498703).

16221233 is a wasteful number, since it uses less digits than its factorization.

16221233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984.

The product of its digits is 432, while the sum is 20.

The square root of 16221233 is about 4027.5591864056. The cubic root of 16221233 is about 253.1402982777.

Adding to 16221233 its reverse (33212261), we get a palindrome (49433494).

The spelling of 16221233 in words is "sixteen million, two hundred twenty-one thousand, two hundred thirty-three".