168159221 has 8 divisors (see below), whose sum is σ = 174219264. Its totient is φ = 162138960.

The previous prime is 168159209. The next prime is 168159227. The reversal of 168159221 is 122951861.

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 168159221 - 2¹⁸ = 167897077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168159227) 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, 1205 + ... + 18378.

It is an arithmetic number, because the mean of its divisors is an integer number (21777408).

Almost surely, 2^168159221 is an apocalyptic number.

It is an amenable number.

168159221 is a deficient number, since it is larger than the sum of its proper divisors (6060043).

168159221 is a wasteful number, since it uses less digits than its factorization.

168159221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19891.

The product of its digits is 8640, while the sum is 35.

The square root of 168159221 is about 12967.6220256453. The cubic root of 168159221 is about 551.9590971670.

The spelling of 168159221 in words is "one hundred sixty-eight million, one hundred fifty-nine thousand, two hundred twenty-one".