115221242139 has 4 divisors (see below), whose sum is σ = 153628322856. Its totient is φ = 76814161424.

The previous prime is 115221242137. The next prime is 115221242161. The reversal of 115221242139 is 931242122511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115221242139 - 2¹ = 115221242137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115221242137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19203540354 + ... + 19203540359.

It is an arithmetic number, because the mean of its divisors is an integer number (38407080714).

Almost surely, 2^115221242139 is an apocalyptic number.

115221242139 is a deficient number, since it is larger than the sum of its proper divisors (38407080717).

115221242139 is an equidigital number, since it uses as much as digits as its factorization.

115221242139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38407080716.

The product of its digits is 8640, while the sum is 33.

The spelling of 115221242139 in words is "one hundred fifteen billion, two hundred twenty-one million, two hundred forty-two thousand, one hundred thirty-nine".