18984482821 has 2 divisors, whose sum is σ = 18984482822. Its totient is φ = 18984482820.

The previous prime is 18984482819. The next prime is 18984482873. The reversal of 18984482821 is 12828448981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18973685025 + 10797796 = 137745^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 18984482821 - 2¹ = 18984482819 is a prime.

Together with 18984482819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18984486821) by changing a digit.

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 as a sum of consecutive naturals, namely, 9492241410 + 9492241411.

It is an arithmetic number, because the mean of its divisors is an integer number (9492241411).

Almost surely, 2^18984482821 is an apocalyptic number.

It is an amenable number.

18984482821 is a deficient number, since it is larger than the sum of its proper divisors (1).

18984482821 is an equidigital number, since it uses as much as digits as its factorization.

18984482821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2359296, while the sum is 55.

The spelling of 18984482821 in words is "eighteen billion, nine hundred eighty-four million, four hundred eighty-two thousand, eight hundred twenty-one".