18492288021 has 6 divisors (see below), whose sum is σ = 26711082710. Its totient is φ = 12328192008.

The previous prime is 18492288011. The next prime is 18492288037. The reversal of 18492288021 is 12088229481.

It can be written as a sum of positive squares in only one way, i.e., 14317319025 + 4174968996 = 119655^2 + 64614^2 .

It is not a de Polignac number, because 18492288021 - 2⁹ = 18492287509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18492288011) 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 5 ways as a sum of consecutive naturals, for example, 1027349326 + ... + 1027349343.

Almost surely, 2^18492288021 is an apocalyptic number.

It is an amenable number.

18492288021 is a deficient number, since it is larger than the sum of its proper divisors (8218794689).

18492288021 is a wasteful number, since it uses less digits than its factorization.

18492288021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054698675 (or 2054698672 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The spelling of 18492288021 in words is "eighteen billion, four hundred ninety-two million, two hundred eighty-eight thousand, twenty-one".