168021 has 24 divisors (see below), whose sum is σ = 291840. Its totient is φ = 95256.

The previous prime is 168013. The next prime is 168023. The reversal of 168021 is 120861.

It is not a de Polignac number, because 168021 - 2³ = 168013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 167985 and 168003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1260 + ... + 1386.

It is an arithmetic number, because the mean of its divisors is an integer number (12160).

2¹⁶⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

168021 is a deficient number, since it is larger than the sum of its proper divisors (123819).

168021 is a wasteful number, since it uses less digits than its factorization.

168021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 168021 is about 409.9036472148. The cubic root of 168021 is about 55.1807825353.

Adding to 168021 its reverse (120861), we get a palindrome (288882).

The spelling of 168021 in words is "one hundred sixty-eight thousand, twenty-one".