2184449728821 has 16 divisors (see below), whose sum is σ = 3066445923840. Its totient is φ = 1379404254960.

The previous prime is 2184449728789. The next prime is 2184449728831. The reversal of 2184449728821 is 1288279444812.

It is not a de Polignac number, because 2184449728821 - 2⁵ = 2184449728789 is a prime.

It is a super-2 number, since 2×2184449728821² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2184449728831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3127425 + ... + 3761606.

It is an arithmetic number, because the mean of its divisors is an integer number (191652870240).

Almost surely, 2^{2184449728821} is an apocalyptic number.

It is an amenable number.

2184449728821 is a deficient number, since it is larger than the sum of its proper divisors (881996195019).

2184449728821 is a wasteful number, since it uses less digits than its factorization.

2184449728821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6894616.

The product of its digits is 16515072, while the sum is 60.

The spelling of 2184449728821 in words is "two trillion, one hundred eighty-four billion, four hundred forty-nine million, seven hundred twenty-eight thousand, eight hundred twenty-one".