2181323216 has 20 divisors (see below), whose sum is σ = 4227384192. Its totient is φ = 1090385376.

The previous prime is 2181323203. The next prime is 2181323237. The reversal of 2181323216 is 6123231812.

It is a happy number.

It is a congruent 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, 57761 + ... + 87743.

Almost surely, 2^2181323216 is an apocalyptic number.

It is an amenable number.

2181323216 is a deficient number, since it is larger than the sum of its proper divisors (2046060976).

2181323216 is a wasteful number, since it uses less digits than its factorization.

2181323216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34538 (or 34532 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 2181323216 is about 46704.6380566213. The cubic root of 2181323216 is about 1296.9005483299.

The spelling of 2181323216 in words is "two billion, one hundred eighty-one million, three hundred twenty-three thousand, two hundred sixteen".