16221356 has 12 divisors (see below), whose sum is σ = 28426440. Its totient is φ = 8099520.

The previous prime is 16221323. The next prime is 16221379. The reversal of 16221356 is 65312261.

It is an unprimeable number.

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, 1076 + ... + 5796.

It is an arithmetic number, because the mean of its divisors is an integer number (2368870).

Almost surely, 2^16221356 is an apocalyptic number.

It is an amenable number.

16221356 is a deficient number, since it is larger than the sum of its proper divisors (12205084).

16221356 is a wasteful number, since it uses less digits than its factorization.

16221356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584 (or 5582 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 16221356 is about 4027.5744561709. The cubic root of 16221356 is about 253.1409381012.

The spelling of 16221356 in words is "sixteen million, two hundred twenty-one thousand, three hundred fifty-six".