18204121 has 8 divisors (see below), whose sum is σ = 19716480. Its totient is φ = 16707792.

The previous prime is 18204119. The next prime is 18204133. The reversal of 18204121 is 12140281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18204121 - 2¹ = 18204119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18204191) 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 in 7 ways as a sum of consecutive naturals, for example, 1585 + ... + 6238.

It is an arithmetic number, because the mean of its divisors is an integer number (2464560).

Almost surely, 2^18204121 is an apocalyptic number.

It is an amenable number.

18204121 is a deficient number, since it is larger than the sum of its proper divisors (1512359).

18204121 is a wasteful number, since it uses less digits than its factorization.

18204121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8015.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 18204121 is about 4266.6287628525. The cubic root of 18204121 is about 263.0610632789.

The spelling of 18204121 in words is "eighteen million, two hundred four thousand, one hundred twenty-one".