16221552 has 20 divisors (see below), whose sum is σ = 41905800. Its totient is φ = 5407168.

The previous prime is 16221529. The next prime is 16221563. The reversal of 16221552 is 25512261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 168927 + ... + 169022.

It is an arithmetic number, because the mean of its divisors is an integer number (2095290).

Almost surely, 2^16221552 is an apocalyptic number.

16221552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16221552 is an abundant number, since it is smaller than the sum of its proper divisors (25684248).

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

16221552 is a wasteful number, since it uses less digits than its factorization.

16221552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337960 (or 337954 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 16221552 is about 4027.5987883601. The cubic root of 16221552 is about 253.1419576507.

The spelling of 16221552 in words is "sixteen million, two hundred twenty-one thousand, five hundred fifty-two".