168301321 has 2 divisors, whose sum is σ = 168301322. Its totient is φ = 168301320.

The previous prime is 168301319. The next prime is 168301361. The reversal of 168301321 is 123103861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167417721 + 883600 = 12939^2 + 940^2 .

It is an emirp because it is prime and its reverse (123103861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168301321 - 2¹ = 168301319 is a prime.

Together with 168301319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (168301361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84150660 + 84150661.

It is an arithmetic number, because the mean of its divisors is an integer number (84150661).

Almost surely, 2^168301321 is an apocalyptic number.

It is an amenable number.

168301321 is a deficient number, since it is larger than the sum of its proper divisors (1).

168301321 is an equidigital number, since it uses as much as digits as its factorization.

168301321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 168301321 is about 12973.0998994072. The cubic root of 168301321 is about 552.1145278449.

The spelling of 168301321 in words is "one hundred sixty-eight million, three hundred one thousand, three hundred twenty-one".