18330121 has 4 divisors (see below), whose sum is σ = 18340992. Its totient is φ = 18319252.

The previous prime is 18330119. The next prime is 18330127. The reversal of 18330121 is 12103381.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18330121 - 2¹ = 18330119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18330127) 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, 2305 + ... + 6478.

It is an arithmetic number, because the mean of its divisors is an integer number (4585248).

Almost surely, 2^18330121 is an apocalyptic number.

It is an amenable number.

18330121 is a deficient number, since it is larger than the sum of its proper divisors (10871).

18330121 is an equidigital number, since it uses as much as digits as its factorization.

18330121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10870.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18330121 is about 4281.3690567387. The cubic root of 18330121 is about 263.6665949226. Note that the first 3 decimals are identical.

The spelling of 18330121 in words is "eighteen million, three hundred thirty thousand, one hundred twenty-one".