2180021808 has 40 divisors (see below), whose sum is σ = 5637750768. Its totient is φ = 725896192.

The previous prime is 2180021801. The next prime is 2180021887. The reversal of 2180021808 is 8081200812.

It is not an unprimeable number, because it can be changed into a prime (2180021801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21916 + ... + 69572.

Almost surely, 2^2180021808 is an apocalyptic number.

It is an amenable number.

2180021808 is an abundant number, since it is smaller than the sum of its proper divisors (3457728960).

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

2180021808 is a wasteful number, since it uses less digits than its factorization.

2180021808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48621 (or 48615 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 2180021808 is about 46690.7036571521. The cubic root of 2180021808 is about 1296.6425806734.

The spelling of 2180021808 in words is "two billion, one hundred eighty million, twenty-one thousand, eight hundred eight".