318021 has 16 divisors (see below), whose sum is σ = 483840. Its totient is φ = 183920.

The previous prime is 318007. The next prime is 318023. The reversal of 318021 is 120813.

It is a happy number.

It is not a de Polignac number, because 318021 - 2⁶ = 317957 is a prime.

It is a super-2 number, since 2×318021² = 202274712882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550 + ... + 968.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2³¹⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

318021 is a deficient number, since it is larger than the sum of its proper divisors (165819).

318021 is a wasteful number, since it uses less digits than its factorization.

318021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 318021 is about 563.9335067187. The cubic root of 318021 is about 68.2577444284.

Adding to 318021 its reverse (120813), we get a palindrome (438834).

The spelling of 318021 in words is "three hundred eighteen thousand, twenty-one".