2181322844 has 12 divisors (see below), whose sum is σ = 3819616584. Its totient is φ = 1090003824.

The previous prime is 2181322837. The next prime is 2181322867. The reversal of 2181322844 is 4482231812.

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, 156899 + ... + 170234.

It is an arithmetic number, because the mean of its divisors is an integer number (318301382).

Almost surely, 2^2181322844 is an apocalyptic number.

It is an amenable number.

2181322844 is a deficient number, since it is larger than the sum of its proper divisors (1638293740).

2181322844 is a wasteful number, since it uses less digits than its factorization.

2181322844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328804 (or 328802 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 2181322844 is about 46704.6340741473. The cubic root of 2181322844 is about 1296.9004746060.

The spelling of 2181322844 in words is "two billion, one hundred eighty-one million, three hundred twenty-two thousand, eight hundred forty-four".