18437302821 has 24 divisors (see below), whose sum is σ = 29651456064. Its totient is φ = 9981092160.

The previous prime is 18437302811. The next prime is 18437302843. The reversal of 18437302821 is 12820373481.

It is not a de Polignac number, because 18437302821 - 2⁹ = 18437302309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18437302821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18437302811) 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 23 ways as a sum of consecutive naturals, for example, 1208440 + ... + 1223601.

It is an arithmetic number, because the mean of its divisors is an integer number (1235477336).

Almost surely, 2^18437302821 is an apocalyptic number.

It is an amenable number.

18437302821 is a deficient number, since it is larger than the sum of its proper divisors (11214153243).

18437302821 is a wasteful number, since it uses less digits than its factorization.

18437302821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432089 (or 2432070 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 18437302821 in words is "eighteen billion, four hundred thirty-seven million, three hundred two thousand, eight hundred twenty-one".