2181688292 has 12 divisors (see below), whose sum is σ = 4363376640. Its totient is φ = 935009256.

The previous prime is 2181688273. The next prime is 2181688331. The reversal of 2181688292 is 2928861812.

2181688292 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38958692 + ... + 38958747.

It is an arithmetic number, because the mean of its divisors is an integer number (363614720).

Almost surely, 2^2181688292 is an apocalyptic number.

It is an amenable number.

2181688292 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2181688292 is a wasteful number, since it uses less digits than its factorization.

2181688292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77917450 (or 77917448 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 2181688292 is about 46708.5462415605. The cubic root of 2181688292 is about 1296.9728959841.

The spelling of 2181688292 in words is "two billion, one hundred eighty-one million, six hundred eighty-eight thousand, two hundred ninety-two".