316021 has 4 divisors (see below), whose sum is σ = 320544. Its totient is φ = 311500.

The previous prime is 316003. The next prime is 316031. The reversal of 316021 is 120613.

It is the 230-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120613 = 103 ⋅1171.

It is a cyclic number.

It is not a de Polignac number, because 316021 - 2⁷ = 315893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315992 and 316010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155 + ... + 2296.

It is an arithmetic number, because the mean of its divisors is an integer number (80136).

2³¹⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

316021 is a deficient number, since it is larger than the sum of its proper divisors (4523).

316021 is an equidigital number, since it uses as much as digits as its factorization.

316021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 316021 is about 562.1574512537. The cubic root of 316021 is about 68.1143548723.

Adding to 316021 its reverse (120613), we get a palindrome (436634).

The spelling of 316021 in words is "three hundred sixteen thousand, twenty-one".