18108499321 has 4 divisors (see below), whose sum is σ = 19754726544. Its totient is φ = 16462272100.

The previous prime is 18108499301. The next prime is 18108499333. The reversal of 18108499321 is 12399480181.

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 18108499321 - 2²³ = 18100110713 is a prime.

It is a super-2 number, since 2×18108499321² (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 (18108499301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823113595 + ... + 823113616.

It is an arithmetic number, because the mean of its divisors is an integer number (4938681636).

Almost surely, 2^18108499321 is an apocalyptic number.

18108499321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18108499321 is a deficient number, since it is larger than the sum of its proper divisors (1646227223).

18108499321 is a wasteful number, since it uses less digits than its factorization.

18108499321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646227222.

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 18108499321 in words is "eighteen billion, one hundred eight million, four hundred ninety-nine thousand, three hundred twenty-one".