315321421 has 4 divisors (see below), whose sum is σ = 329031072. Its totient is φ = 301611772.

The previous prime is 315321373. The next prime is 315321431. The reversal of 315321421 is 124123513.

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 315321421 - 2⁹ = 315320909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315321392 and 315321401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315321431) 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, 6854791 + ... + 6854836.

It is an arithmetic number, because the mean of its divisors is an integer number (82257768).

Almost surely, 2^315321421 is an apocalyptic number.

It is an amenable number.

315321421 is a deficient number, since it is larger than the sum of its proper divisors (13709651).

315321421 is a wasteful number, since it uses less digits than its factorization.

315321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13709650.

The product of its digits is 720, while the sum is 22.

The square root of 315321421 is about 17757.2920514362. The cubic root of 315321421 is about 680.6405591785.

Adding to 315321421 its reverse (124123513), we get a palindrome (439444934).

The spelling of 315321421 in words is "three hundred fifteen million, three hundred twenty-one thousand, four hundred twenty-one".