115320221 has 4 divisors (see below), whose sum is σ = 115341792. Its totient is φ = 115298652.

The previous prime is 115320169. The next prime is 115320239. The reversal of 115320221 is 122023511.

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 a de Polignac number, because none of the positive numbers 2^k-115320221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115320221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115320241) 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, 3896 + ... + 15678.

It is an arithmetic number, because the mean of its divisors is an integer number (28835448).

Almost surely, 2^115320221 is an apocalyptic number.

It is an amenable number.

115320221 is a deficient number, since it is larger than the sum of its proper divisors (21571).

115320221 is an equidigital number, since it uses as much as digits as its factorization.

115320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21570.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 115320221 is about 10738.7252967938. The cubic root of 115320221 is about 486.7453620056.

Adding to 115320221 its reverse (122023511), we get a palindrome (237343732).

The spelling of 115320221 in words is "one hundred fifteen million, three hundred twenty thousand, two hundred twenty-one".