115415221 has 4 divisors (see below), whose sum is σ = 117870912. Its totient is φ = 112959532.

The previous prime is 115415197. The next prime is 115415231. The reversal of 115415221 is 122514511.

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 115415221 - 2¹¹ = 115413173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115415192 and 115415201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115415231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1227775 + ... + 1227868.

It is an arithmetic number, because the mean of its divisors is an integer number (29467728).

Almost surely, 2^115415221 is an apocalyptic number.

It is an amenable number.

115415221 is a deficient number, since it is larger than the sum of its proper divisors (2455691).

115415221 is an equidigital number, since it uses as much as digits as its factorization.

115415221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455690.

The product of its digits is 400, while the sum is 22.

The square root of 115415221 is about 10743.1476300012. The cubic root of 115415221 is about 486.8789844735.

Adding to 115415221 its reverse (122514511), we get a palindrome (237929732).

The spelling of 115415221 in words is "one hundred fifteen million, four hundred fifteen thousand, two hundred twenty-one".