121044321016818 has 16 divisors (see below), whose sum is σ = 246191839356960. Its totient is φ = 39664240785056.

The previous prime is 121044321016811. The next prime is 121044321016823. The reversal of 121044321016818 is 818610123440121.

It is a self number, because there is not a number n which added to its sum of digits gives 121044321016818.

It is not an unprimeable number, because it can be changed into a prime (121044321016811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170966554755 + ... + 170966555462.

It is an arithmetic number, because the mean of its divisors is an integer number (15386989959810).

Almost surely, 2^{121044321016818} is an apocalyptic number.

121044321016818 is an abundant number, since it is smaller than the sum of its proper divisors (125147518340142).

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

121044321016818 is a wasteful number, since it uses less digits than its factorization.

121044321016818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341933110281.

The product of its (nonzero) digits is 73728, while the sum is 42.

Adding to 121044321016818 its reverse (818610123440121), we get a palindrome (939654444456939).

The spelling of 121044321016818 in words is "one hundred twenty-one trillion, forty-four billion, three hundred twenty-one million, sixteen thousand, eight hundred eighteen".