315423221 has 4 divisors (see below), whose sum is σ = 319416000. Its totient is φ = 311430444.

The previous prime is 315423197. The next prime is 315423271. The reversal of 315423221 is 122324513.

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: 122324513 = 67 ⋅1825739.

It is a cyclic number.

It is not a de Polignac number, because 315423221 - 2²² = 311228917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315423271) 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, 1996271 + ... + 1996428.

It is an arithmetic number, because the mean of its divisors is an integer number (79854000).

Almost surely, 2^315423221 is an apocalyptic number.

It is an amenable number.

315423221 is a deficient number, since it is larger than the sum of its proper divisors (3992779).

315423221 is an equidigital number, since it uses as much as digits as its factorization.

315423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992778.

The product of its digits is 1440, while the sum is 23.

The square root of 315423221 is about 17760.1582481688. The cubic root of 315423221 is about 680.7137984714.

Adding to 315423221 its reverse (122324513), we get a palindrome (437747734).

The spelling of 315423221 in words is "three hundred fifteen million, four hundred twenty-three thousand, two hundred twenty-one".