2101942855278 has 96 divisors (see below), whose sum is σ = 5255086636800. Its totient is φ = 594762594048.

The previous prime is 2101942855231. The next prime is 2101942855297. The reversal of 2101942855278 is 8725582491012.

It is a happy number.

2101942855278 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 94 + 28 + 5 + 527 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17867013 + ... + 17984271.

It is an arithmetic number, because the mean of its divisors is an integer number (54740485800).

Almost surely, 2^{2101942855278} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101942855278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2627543318400).

2101942855278 is an abundant number, since it is smaller than the sum of its proper divisors (3153143781522).

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

2101942855278 is a wasteful number, since it uses less digits than its factorization.

2101942855278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118646 (or 118643 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 2101942855278 in words is "two trillion, one hundred one billion, nine hundred forty-two million, eight hundred fifty-five thousand, two hundred seventy-eight".