2129180872 has 128 divisors (see below), whose sum is σ = 5054918400. Its totient is φ = 818408448.

The previous prime is 2129180813. The next prime is 2129180891. The reversal of 2129180872 is 2780819212.

It is a super-2 number, since 2×2129180872² = 9066822371381360768, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5362978 + ... + 5363374.

It is an arithmetic number, because the mean of its divisors is an integer number (39491550).

Almost surely, 2^2129180872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2129180872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2527459200).

2129180872 is an abundant number, since it is smaller than the sum of its proper divisors (2925737528).

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

2129180872 is a wasteful number, since it uses less digits than its factorization.

2129180872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 611 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 2129180872 is about 46143.0479270713. The cubic root of 2129180872 is about 1286.4833958526.

The spelling of 2129180872 in words is "two billion, one hundred twenty-nine million, one hundred eighty thousand, eight hundred seventy-two".