115213220 has 12 divisors (see below), whose sum is σ = 241947804. Its totient is φ = 46085280.

The previous prime is 115213193. The next prime is 115213243. The reversal of 115213220 is 22312511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55830784 + 59382436 = 7472^2 + 7706^2 .

It is an unprimeable number.

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, 2880311 + ... + 2880350.

It is an arithmetic number, because the mean of its divisors is an integer number (20162317).

Almost surely, 2^115213220 is an apocalyptic number.

115213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115213220 is an abundant number, since it is smaller than the sum of its proper divisors (126734584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

115213220 is a wasteful number, since it uses less digits than its factorization.

115213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760670 (or 5760668 counting only the distinct ones).

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

The square root of 115213220 is about 10733.7421247205. The cubic root of 115213220 is about 486.5947715984.

Adding to 115213220 its reverse (22312511), we get a palindrome (137525731).

It can be divided in two parts, 11521 and 3220, that added together give a palindrome (14741).

The spelling of 115213220 in words is "one hundred fifteen million, two hundred thirteen thousand, two hundred twenty".