168252121 has 4 divisors (see below), whose sum is σ = 168316852. Its totient is φ = 168187392.

The previous prime is 168252083. The next prime is 168252131. The reversal of 168252121 is 121252861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121252861 = 1049 ⋅115589.

It can be written as a sum of positive squares in 2 ways, for example, as 167340096 + 912025 = 12936^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 168252121 - 2⁹ = 168251609 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 168252121.

It is not an unprimeable number, because it can be changed into a prime (168252131) 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 3 ways as a sum of consecutive naturals, for example, 28296 + ... + 33721.

It is an arithmetic number, because the mean of its divisors is an integer number (42079213).

Almost surely, 2^168252121 is an apocalyptic number.

It is an amenable number.

168252121 is a deficient number, since it is larger than the sum of its proper divisors (64731).

168252121 is an equidigital number, since it uses as much as digits as its factorization.

168252121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64730.

The product of its digits is 1920, while the sum is 28.

The square root of 168252121 is about 12971.2035293569. The cubic root of 168252121 is about 552.0607222023.

The spelling of 168252121 in words is "one hundred sixty-eight million, two hundred fifty-two thousand, one hundred twenty-one".