100121378864 has 40 divisors (see below), whose sum is σ = 219902227440. Its totient is φ = 43777767168.

The previous prime is 100121378843. The next prime is 100121378879. The reversal of 100121378864 is 468873121001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12663227 + ... + 12671130.

It is an arithmetic number, because the mean of its divisors is an integer number (5497555686).

Almost surely, 2^100121378864 is an apocalyptic number.

It is an amenable number.

100121378864 is an abundant number, since it is smaller than the sum of its proper divisors (119780848576).

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

100121378864 is a wasteful number, since it uses less digits than its factorization.

100121378864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25334397 (or 25334391 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

Adding to 100121378864 its reverse (468873121001), we get a palindrome (568994499865).

The spelling of 100121378864 in words is "one hundred billion, one hundred twenty-one million, three hundred seventy-eight thousand, eight hundred sixty-four".