18419320321 has 4 divisors (see below), whose sum is σ = 18419889600. Its totient is φ = 18418751044.

The previous prime is 18419320319. The next prime is 18419320357. The reversal of 18419320321 is 12302391481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18419320321 - 2¹ = 18419320319 is a prime.

It is a super-2 number, since 2×18419320321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18419320421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232981 + ... + 301858.

It is an arithmetic number, because the mean of its divisors is an integer number (4604972400).

Almost surely, 2^18419320321 is an apocalyptic number.

It is an amenable number.

18419320321 is a deficient number, since it is larger than the sum of its proper divisors (569279).

18419320321 is an equidigital number, since it uses as much as digits as its factorization.

18419320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569278.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 18419320321 in words is "eighteen billion, four hundred nineteen million, three hundred twenty thousand, three hundred twenty-one".