315343221 has 16 divisors (see below), whose sum is σ = 428930880. Its totient is φ = 206017920.

The previous prime is 315343211. The next prime is 315343229. The reversal of 315343221 is 122343513.

It is not a de Polignac number, because 315343221 - 2⁶ = 315343157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 315343191 and 315343200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315343229) 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, 48745 + ... + 54833.

It is an arithmetic number, because the mean of its divisors is an integer number (26808180).

Almost surely, 2^315343221 is an apocalyptic number.

It is an amenable number.

315343221 is a deficient number, since it is larger than the sum of its proper divisors (113587659).

315343221 is a wasteful number, since it uses less digits than its factorization.

315343221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6436.

The product of its digits is 2160, while the sum is 24.

The square root of 315343221 is about 17757.9058731597. The cubic root of 315343221 is about 680.6562443612.

Adding to 315343221 its reverse (122343513), we get a palindrome (437686734).

The spelling of 315343221 in words is "three hundred fifteen million, three hundred forty-three thousand, two hundred twenty-one".