115440221 has 8 divisors (see below), whose sum is σ = 124565280. Its totient is φ = 106350192.

The previous prime is 115440211. The next prime is 115440223. The reversal of 115440221 is 122044511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-115440221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115440193 and 115440202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115440223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1691 + ... + 15288.

It is an arithmetic number, because the mean of its divisors is an integer number (15570660).

Almost surely, 2^115440221 is an apocalyptic number.

It is an amenable number.

115440221 is a deficient number, since it is larger than the sum of its proper divisors (9125059).

115440221 is a wasteful number, since it uses less digits than its factorization.

115440221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17515.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 115440221 is about 10744.3110993679. The cubic root of 115440221 is about 486.9141360932.

Adding to 115440221 its reverse (122044511), we get a palindrome (237484732).

The spelling of 115440221 in words is "one hundred fifteen million, four hundred forty thousand, two hundred twenty-one".