2181805772 has 24 divisors (see below), whose sum is σ = 4050217584. Its totient is φ = 1024837632.

The previous prime is 2181805757. The next prime is 2181805799. The reversal of 2181805772 is 2775081812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7868 + ... + 66524.

It is an arithmetic number, because the mean of its divisors is an integer number (168759066).

Almost surely, 2^2181805772 is an apocalyptic number.

It is an amenable number.

2181805772 is a deficient number, since it is larger than the sum of its proper divisors (1868411812).

2181805772 is a wasteful number, since it uses less digits than its factorization.

2181805772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59225 (or 59223 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 41.

The square root of 2181805772 is about 46709.8038103351. The cubic root of 2181805772 is about 1296.9961754540.

The spelling of 2181805772 in words is "two billion, one hundred eighty-one million, eight hundred five thousand, seven hundred seventy-two".