2181508986 has 24 divisors (see below), whose sum is σ = 4634766720. Its totient is φ = 684394432.

The previous prime is 2181508949. The next prime is 2181509041. The reversal of 2181508986 is 6898051812.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 627306 + ... + 630773.

It is an arithmetic number, because the mean of its divisors is an integer number (193115280).

Almost surely, 2^2181508986 is an apocalyptic number.

2181508986 is an abundant number, since it is smaller than the sum of its proper divisors (2453257734).

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

2181508986 is a wasteful number, since it uses less digits than its factorization.

2181508986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258118 (or 1258101 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 48.

The square root of 2181508986 is about 46706.6267889258. The cubic root of 2181508986 is about 1296.9373636559.

The spelling of 2181508986 in words is "two billion, one hundred eighty-one million, five hundred eight thousand, nine hundred eighty-six".