2102720131688 has 24 divisors (see below), whose sum is σ = 4333601926290. Its totient is φ = 955781877600.

The previous prime is 2102720131669. The next prime is 2102720131709. The reversal of 2102720131688 is 8861310272012.

It can be written as a sum of positive squares in only one way, i.e., 1928382150244 + 174337981444 = 1388662^2 + 417538^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1086114803 + ... + 1086116738.

Almost surely, 2^{2102720131688} is an apocalyptic number.

It is an amenable number.

2102720131688 is an abundant number, since it is smaller than the sum of its proper divisors (2230881794602).

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

2102720131688 is a wasteful number, since it uses less digits than its factorization.

2102720131688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172231569 (or 2172231554 counting only the distinct ones).

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

The spelling of 2102720131688 in words is "two trillion, one hundred two billion, seven hundred twenty million, one hundred thirty-one thousand, six hundred eighty-eight".