121442241815 has 4 divisors (see below), whose sum is σ = 145730690184. Its totient is φ = 97153793448.

The previous prime is 121442241799. The next prime is 121442241829. The reversal of 121442241815 is 518142244121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518142244121 = 53 ⋅9776268757.

It is a cyclic number.

It is not a de Polignac number, because 121442241815 - 2⁴ = 121442241799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12144224177 + ... + 12144224186.

It is an arithmetic number, because the mean of its divisors is an integer number (36432672546).

Almost surely, 2^121442241815 is an apocalyptic number.

121442241815 is a deficient number, since it is larger than the sum of its proper divisors (24288448369).

121442241815 is an equidigital number, since it uses as much as digits as its factorization.

121442241815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24288448368.

The product of its digits is 20480, while the sum is 35.

Adding to 121442241815 its reverse (518142244121), we get a palindrome (639584485936).

The spelling of 121442241815 in words is "one hundred twenty-one billion, four hundred forty-two million, two hundred forty-one thousand, eight hundred fifteen".