18052121 has 4 divisors (see below), whose sum is σ = 18062352. Its totient is φ = 18041892.

The previous prime is 18052117. The next prime is 18052127. The reversal of 18052121 is 12125081.

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, 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 18052121 - 2² = 18052117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18052093 and 18052102.

It is not an unprimeable number, because it can be changed into a prime (18052127) 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, 1715 + ... + 6248.

It is an arithmetic number, because the mean of its divisors is an integer number (4515588).

Almost surely, 2^18052121 is an apocalyptic number.

It is an amenable number.

18052121 is a deficient number, since it is larger than the sum of its proper divisors (10231).

18052121 is an equidigital number, since it uses as much as digits as its factorization.

18052121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10230.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18052121 is about 4248.7787657161. The cubic root of 18052121 is about 262.3268505899.

The spelling of 18052121 in words is "eighteen million, fifty-two thousand, one hundred twenty-one".