100721878748155 has 32 divisors (see below), whose sum is σ = 149108936832000. Its totient is φ = 63785489615232.

The previous prime is 100721878748149. The next prime is 100721878748203. The reversal of 100721878748155 is 551847878127001.

It is not a de Polignac number, because 100721878748155 - 2³ = 100721878748147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2157224005 + ... + 2157270694.

It is an arithmetic number, because the mean of its divisors is an integer number (4659654276000).

Almost surely, 2^{100721878748155} is an apocalyptic number.

100721878748155 is a deficient number, since it is larger than the sum of its proper divisors (48387058083845).

100721878748155 is a wasteful number, since it uses less digits than its factorization.

100721878748155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4314494763.

The product of its (nonzero) digits is 35123200, while the sum is 64.

The spelling of 100721878748155 in words is "one hundred trillion, seven hundred twenty-one billion, eight hundred seventy-eight million, seven hundred forty-eight thousand, one hundred fifty-five".