315309021 has 4 divisors (see below), whose sum is σ = 420412032. Its totient is φ = 210206012.

The previous prime is 315309017. The next prime is 315309023. The reversal of 315309021 is 120903513.

It is a happy 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.

It is a cyclic number.

It is not a de Polignac number, because 315309021 - 2² = 315309017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 315308982 and 315309000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315309023) 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, 52551501 + ... + 52551506.

It is an arithmetic number, because the mean of its divisors is an integer number (105103008).

Almost surely, 2^315309021 is an apocalyptic number.

It is an amenable number.

315309021 is a deficient number, since it is larger than the sum of its proper divisors (105103011).

315309021 is a wasteful number, since it uses less digits than its factorization.

315309021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105103010.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 315309021 is about 17756.9428956676. The cubic root of 315309021 is about 680.6316370089.

The spelling of 315309021 in words is "three hundred fifteen million, three hundred nine thousand, twenty-one".