168289221 has 8 divisors (see below), whose sum is σ = 225325440. Its totient is φ = 111722912.

The previous prime is 168289217. The next prime is 168289237. The reversal of 168289221 is 122982861.

168289221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 168289221 - 2² = 168289217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 168289221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168289211) 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, 116640 + ... + 118073.

It is an arithmetic number, because the mean of its divisors is an integer number (28165680).

Almost surely, 2^168289221 is an apocalyptic number.

It is an amenable number.

168289221 is a deficient number, since it is larger than the sum of its proper divisors (57036219).

168289221 is a wasteful number, since it uses less digits than its factorization.

168289221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234955.

The product of its digits is 27648, while the sum is 39.

The square root of 168289221 is about 12972.6335414210. The cubic root of 168289221 is about 552.1012961288.

The spelling of 168289221 in words is "one hundred sixty-eight million, two hundred eighty-nine thousand, two hundred twenty-one".