121291612442 has 32 divisors (see below), whose sum is σ = 244279615104. Its totient is φ = 43621358400.

The previous prime is 121291612423. The next prime is 121291612447. The reversal of 121291612442 is 244216192121.

It is not an unprimeable number, because it can be changed into a prime (121291612447) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 30290609 + ... + 30294612.

It is an arithmetic number, because the mean of its divisors is an integer number (7633737972).

Almost surely, 2^121291612442 is an apocalyptic number.

121291612442 is an abundant number, since it is smaller than the sum of its proper divisors (122988002662).

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

121291612442 is a wasteful number, since it uses less digits than its factorization.

121291612442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60585254.

The product of its digits is 13824, while the sum is 35.

The spelling of 121291612442 in words is "one hundred twenty-one billion, two hundred ninety-one million, six hundred twelve thousand, four hundred forty-two".