18302454421 has 2 divisors, whose sum is σ = 18302454422. Its totient is φ = 18302454420.

The previous prime is 18302454397. The next prime is 18302454461. The reversal of 18302454421 is 12445420381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18254982321 + 47472100 = 135111^2 + 6890^2 .

It is a cyclic number.

It is not a de Polignac number, because 18302454421 - 2⁵ = 18302454389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18302454461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9151227210 + 9151227211.

It is an arithmetic number, because the mean of its divisors is an integer number (9151227211).

Almost surely, 2^18302454421 is an apocalyptic number.

It is an amenable number.

18302454421 is a deficient number, since it is larger than the sum of its proper divisors (1).

18302454421 is an equidigital number, since it uses as much as digits as its factorization.

18302454421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 34.

The spelling of 18302454421 in words is "eighteen billion, three hundred two million, four hundred fifty-four thousand, four hundred twenty-one".