18712228421399 has 2 divisors, whose sum is σ = 18712228421400. Its totient is φ = 18712228421398.

The previous prime is 18712228421329. The next prime is 18712228421443. The reversal of 18712228421399 is 99312482221781.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (99312482221781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18712228421399 - 2³² = 18707933454103 is a prime.

It is a super-2 number, since 2×18712228421399² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18712228421329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9356114210699 + 9356114210700.

It is an arithmetic number, because the mean of its divisors is an integer number (9356114210700).

Almost surely, 2^{18712228421399} is an apocalyptic number.

18712228421399 is a deficient number, since it is larger than the sum of its proper divisors (1).

18712228421399 is an equidigital number, since it uses as much as digits as its factorization.

18712228421399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 59.

The spelling of 18712228421399 in words is "eighteen trillion, seven hundred twelve billion, two hundred twenty-eight million, four hundred twenty-one thousand, three hundred ninety-nine".