18341405021 has 2 divisors, whose sum is σ = 18341405022. Its totient is φ = 18341405020.

The previous prime is 18341405011. The next prime is 18341405041. The reversal of 18341405021 is 12050414381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12067022500 + 6274382521 = 109850^2 + 79211^2 .

It is a cyclic number.

It is not a de Polignac number, because 18341405021 - 2¹⁸ = 18341142877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18341405011) 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 as a sum of consecutive naturals, namely, 9170702510 + 9170702511.

It is an arithmetic number, because the mean of its divisors is an integer number (9170702511).

Almost surely, 2^18341405021 is an apocalyptic number.

It is an amenable number.

18341405021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18341405021 is an equidigital number, since it uses as much as digits as its factorization.

18341405021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 18341405021 in words is "eighteen billion, three hundred forty-one million, four hundred five thousand, twenty-one".