18872092321 has 2 divisors, whose sum is σ = 18872092322. Its totient is φ = 18872092320.

The previous prime is 18872092297. The next prime is 18872092339. The reversal of 18872092321 is 12329027881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18005614225 + 866478096 = 134185^2 + 29436^2 .

It is a cyclic number.

It is not a de Polignac number, because 18872092321 - 2¹¹ = 18872090273 is a prime.

It is not a weakly prime, because it can be changed into another prime (18872092021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436046160 + 9436046161.

It is an arithmetic number, because the mean of its divisors is an integer number (9436046161).

Almost surely, 2^18872092321 is an apocalyptic number.

It is an amenable number.

18872092321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872092321 is an equidigital number, since it uses as much as digits as its factorization.

18872092321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 18872092321 in words is "eighteen billion, eight hundred seventy-two million, ninety-two thousand, three hundred twenty-one".