16608221 has 8 divisors (see below), whose sum is σ = 19155840. Its totient is φ = 14104368.

The previous prime is 16608211. The next prime is 16608247. The reversal of 16608221 is 12280661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16608221 is a prime.

It is a super-3 number, since 3×16608221³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16608211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10121 + ... + 11646.

It is an arithmetic number, because the mean of its divisors is an integer number (2394480).

Almost surely, 2^16608221 is an apocalyptic number.

It is an amenable number.

16608221 is a deficient number, since it is larger than the sum of its proper divisors (2547619).

16608221 is a wasteful number, since it uses less digits than its factorization.

16608221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21883.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 16608221 is about 4075.3185151593. The cubic root of 16608221 is about 255.1375446609.

Adding to 16608221 its reverse (12280661), we get a palindrome (28888882).

The spelling of 16608221 in words is "sixteen million, six hundred eight thousand, two hundred twenty-one".