2181858364 has 24 divisors (see below), whose sum is σ = 4369027040. Its totient is φ = 933944256.

The previous prime is 2181858311. The next prime is 2181858377. The reversal of 2181858364 is 4638581812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23787 + ... + 70210.

Almost surely, 2^2181858364 is an apocalyptic number.

It is an amenable number.

2181858364 is an abundant number, since it is smaller than the sum of its proper divisors (2187168676).

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

2181858364 is a wasteful number, since it uses less digits than its factorization.

2181858364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94837 (or 94835 counting only the distinct ones).

The product of its digits is 368640, while the sum is 46.

The square root of 2181858364 is about 46710.3667722702. The cubic root of 2181858364 is about 1297.0065966497.

The spelling of 2181858364 in words is "two billion, one hundred eighty-one million, eight hundred fifty-eight thousand, three hundred sixty-four".