121355402343242 has 32 divisors (see below), whose sum is σ = 195239065547520. Its totient is φ = 56396666439360.

The previous prime is 121355402343199. The next prime is 121355402343247. The reversal of 121355402343242 is 242343204553121.

It is a self number, because there is not a number n which added to its sum of digits gives 121355402343242.

It is not an unprimeable number, because it can be changed into a prime (121355402343247) 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, 38382767 + ... + 41423997.

It is an arithmetic number, because the mean of its divisors is an integer number (6101220798360).

Almost surely, 2^{121355402343242} is an apocalyptic number.

121355402343242 is a deficient number, since it is larger than the sum of its proper divisors (73883663204278).

121355402343242 is a wasteful number, since it uses less digits than its factorization.

121355402343242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3061118.

The product of its (nonzero) digits is 691200, while the sum is 41.

Adding to 121355402343242 its reverse (242343204553121), we get a palindrome (363698606896363).

The spelling of 121355402343242 in words is "one hundred twenty-one trillion, three hundred fifty-five billion, four hundred two million, three hundred forty-three thousand, two hundred forty-two".