18300821399 has 12 divisors (see below), whose sum is σ = 21308686200. Its totient is φ = 15671699568.

The previous prime is 18300821369. The next prime is 18300821411. The reversal of 18300821399 is 99312800381.

It is not a de Polignac number, because 18300821399 - 2²⁰ = 18299772823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18300821339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122309 + ... + 227070.

It is an arithmetic number, because the mean of its divisors is an integer number (1775723850).

Almost surely, 2^18300821399 is an apocalyptic number.

18300821399 is a deficient number, since it is larger than the sum of its proper divisors (3007864801).

18300821399 is a wasteful number, since it uses less digits than its factorization.

18300821399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350462 (or 350455 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 18300821399 in words is "eighteen billion, three hundred million, eight hundred twenty-one thousand, three hundred ninety-nine".