121505243043 has 16 divisors (see below), whose sum is σ = 167971806720. Its totient is φ = 78033699744.

The previous prime is 121505243023. The next prime is 121505243047. The reversal of 121505243043 is 340342505121.

It is not a de Polignac number, because 121505243043 - 2⁶ = 121505242979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121505243043.

It is not an unprimeable number, because it can be changed into a prime (121505243047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1537771 + ... + 1614852.

It is an arithmetic number, because the mean of its divisors is an integer number (10498237920).

Almost surely, 2^121505243043 is an apocalyptic number.

121505243043 is a deficient number, since it is larger than the sum of its proper divisors (46466563677).

121505243043 is a wasteful number, since it uses less digits than its factorization.

121505243043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3153098.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 121505243043 its reverse (340342505121), we get a palindrome (461847748164).

The spelling of 121505243043 in words is "one hundred twenty-one billion, five hundred five million, two hundred forty-three thousand, forty-three".