2315243221 has 4 divisors (see below), whose sum is σ = 2315607372. Its totient is φ = 2314879072.

The previous prime is 2315243213. The next prime is 2315243261. The reversal of 2315243221 is 1223425132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 445632100 + 1869611121 = 21110^2 + 43239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2315243221 - 2³ = 2315243213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2315243201) 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, 172366 + ... + 185311.

It is an arithmetic number, because the mean of its divisors is an integer number (578901843).

Almost surely, 2^2315243221 is an apocalyptic number.

It is an amenable number.

2315243221 is a deficient number, since it is larger than the sum of its proper divisors (364151).

2315243221 is an equidigital number, since it uses as much as digits as its factorization.

2315243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364150.

The product of its digits is 2880, while the sum is 25.

The square root of 2315243221 is about 48116.9743541715. The cubic root of 2315243221 is about 1322.9158112312.

Adding to 2315243221 its reverse (1223425132), we get a palindrome (3538668353).

The spelling of 2315243221 in words is "two billion, three hundred fifteen million, two hundred forty-three thousand, two hundred twenty-one".