18423122321 has 2 divisors, whose sum is σ = 18423122322. Its totient is φ = 18423122320.

The previous prime is 18423122317. The next prime is 18423122363. The reversal of 18423122321 is 12322132481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16682563921 + 1740558400 = 129161^2 + 41720^2 .

It is an emirp because it is prime and its reverse (12322132481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18423122321 - 2² = 18423122317 is a prime.

It is a super-2 number, since 2×18423122321² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18423125321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9211561160 + 9211561161.

It is an arithmetic number, because the mean of its divisors is an integer number (9211561161).

Almost surely, 2^18423122321 is an apocalyptic number.

It is an amenable number.

18423122321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18423122321 is an equidigital number, since it uses as much as digits as its factorization.

18423122321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

The spelling of 18423122321 in words is "eighteen billion, four hundred twenty-three million, one hundred twenty-two thousand, three hundred twenty-one".