16221056 has 32 divisors (see below), whose sum is σ = 32497200. Its totient is φ = 8065024.

The previous prime is 16221031. The next prime is 16221061. The reversal of 16221056 is 65012261.

It is a tau number, because it is divible by the number of its divisors (32).

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

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, 45005 + ... + 45363.

Almost surely, 2^16221056 is an apocalyptic number.

16221056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16221056 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

16221056 is an equidigital number, since it uses as much as digits as its factorization.

16221056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 16221056 is about 4027.5372127393. The cubic root of 16221056 is about 253.1393775505.

The spelling of 16221056 in words is "sixteen million, two hundred twenty-one thousand, fifty-six".