115640832221 has 4 divisors (see below), whose sum is σ = 115642120572. Its totient is φ = 115639543872.

The previous prime is 115640832211. The next prime is 115640832227. The reversal of 115640832221 is 122238046511.

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 108481303225 + 7159528996 = 329365^2 + 84614^2 .

It is a cyclic number.

It is not a de Polignac number, because 115640832221 - 2¹⁰ = 115640831197 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 (115640832227) 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, 498566 + ... + 692711.

It is an arithmetic number, because the mean of its divisors is an integer number (28910530143).

Almost surely, 2^115640832221 is an apocalyptic number.

It is an amenable number.

115640832221 is a deficient number, since it is larger than the sum of its proper divisors (1288351).

115640832221 is an equidigital number, since it uses as much as digits as its factorization.

115640832221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288350.

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 115640832221 its reverse (122238046511), we get a palindrome (237878878732).

The spelling of 115640832221 in words is "one hundred fifteen billion, six hundred forty million, eight hundred thirty-two thousand, two hundred twenty-one".