168393321 has 12 divisors (see below), whose sum is σ = 244328448. Its totient is φ = 111757464.

The previous prime is 168393307. The next prime is 168393331. The reversal of 168393321 is 123393861.

It is not a de Polignac number, because 168393321 - 2¹⁰ = 168392297 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (168393301) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 39945 + ... + 43958.

It is an arithmetic number, because the mean of its divisors is an integer number (20360704).

Almost surely, 2^168393321 is an apocalyptic number.

It is an amenable number.

168393321 is a deficient number, since it is larger than the sum of its proper divisors (75935127).

168393321 is a wasteful number, since it uses less digits than its factorization.

168393321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84132 (or 84129 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 168393321 is about 12976.6452136136. The cubic root of 168393321 is about 552.2151118919.

The spelling of 168393321 in words is "one hundred sixty-eight million, three hundred ninety-three thousand, three hundred twenty-one".