2181823044 has 48 divisors (see below), whose sum is σ = 5442772608. Its totient is φ = 677841408.

The previous prime is 2181823001. The next prime is 2181823081. The reversal of 2181823044 is 4403281812.

It is a junction number, because it is equal to n+sod(n) for n = 2181822996 and 2181823014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30907 + ... + 72930.

It is an arithmetic number, because the mean of its divisors is an integer number (113391096).

Almost surely, 2^2181823044 is an apocalyptic number.

It is an amenable number.

2181823044 is an abundant number, since it is smaller than the sum of its proper divisors (3260949564).

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

2181823044 is a wasteful number, since it uses less digits than its factorization.

2181823044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103964 (or 103962 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 2181823044 is about 46709.9886962093. The cubic root of 2181823044 is about 1296.9995979492. Note that the first 3 decimals are identical.

The spelling of 2181823044 in words is "two billion, one hundred eighty-one million, eight hundred twenty-three thousand, forty-four".