313000021 has 4 divisors (see below), whose sum is σ = 317408544. Its totient is φ = 308591500.

The previous prime is 313000013. The next prime is 313000049. The reversal of 313000021 is 120000313.

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.

It is a cyclic number.

It is not a de Polignac number, because 313000021 - 2³ = 313000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312999971 and 313000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313000001) 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, 2204155 + ... + 2204296.

It is an arithmetic number, because the mean of its divisors is an integer number (79352136).

Almost surely, 2^313000021 is an apocalyptic number.

It is an amenable number.

313000021 is a deficient number, since it is larger than the sum of its proper divisors (4408523).

313000021 is an equidigital number, since it uses as much as digits as its factorization.

313000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408522.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 313000021 is about 17691.8066064492. The cubic root of 313000021 is about 678.9661488283.

Adding to 313000021 its reverse (120000313), we get a palindrome (433000334).

The spelling of 313000021 in words is "three hundred thirteen million, twenty-one", and thus it is an aban number.