2184879821 has 4 divisors (see below), whose sum is σ = 2204924700. Its totient is φ = 2164834944.

The previous prime is 2184879811. The next prime is 2184879833. The reversal of 2184879821 is 1289784812.

2184879821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1769127721 + 415752100 = 42061^2 + 20390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2184879821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2184879821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2184879811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10022276 + ... + 10022493.

It is an arithmetic number, because the mean of its divisors is an integer number (551231175).

Almost surely, 2^2184879821 is an apocalyptic number.

It is an amenable number.

2184879821 is a deficient number, since it is larger than the sum of its proper divisors (20044879).

2184879821 is a wasteful number, since it uses less digits than its factorization.

2184879821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20044878.

The product of its digits is 516096, while the sum is 50.

The square root of 2184879821 is about 46742.6980500698. The cubic root of 2184879821 is about 1297.6050226159.

The spelling of 2184879821 in words is "two billion, one hundred eighty-four million, eight hundred seventy-nine thousand, eight hundred twenty-one".