16221288 has 32 divisors (see below), whose sum is σ = 42688800. Its totient is φ = 5122368.

The previous prime is 16221253. The next prime is 16221311. The reversal of 16221288 is 88212261.

16221288 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17331 + ... + 18242.

It is an arithmetic number, because the mean of its divisors is an integer number (1334025).

Almost surely, 2^16221288 is an apocalyptic number.

It is an amenable number.

16221288 is an abundant number, since it is smaller than the sum of its proper divisors (26467512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16221288 is a wasteful number, since it uses less digits than its factorization.

16221288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35601 (or 35597 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 16221288 is about 4027.5660143566. The cubic root of 16221288 is about 253.1405843781.

The spelling of 16221288 in words is "sixteen million, two hundred twenty-one thousand, two hundred eighty-eight".