2181012204 has 48 divisors (see below), whose sum is σ = 6122144000. Its totient is φ = 590348736.

The previous prime is 2181012203. The next prime is 2181012221. The reversal of 2181012204 is 4022101812.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2181012203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681679 + ... + 684870.

Almost surely, 2^2181012204 is an apocalyptic number.

It is an amenable number.

2181012204 is an abundant number, since it is smaller than the sum of its proper divisors (3941131796).

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

2181012204 is a wasteful number, since it uses less digits than its factorization.

2181012204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366582 (or 1366580 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 2181012204 is about 46701.3083756762. The cubic root of 2181012204 is about 1296.8389082511.

The spelling of 2181012204 in words is "two billion, one hundred eighty-one million, twelve thousand, two hundred four".