18014021 has 2 divisors, whose sum is σ = 18014022. Its totient is φ = 18014020.

The previous prime is 18013997. The next prime is 18014063. The reversal of 18014021 is 12041081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 3276100 = 3839^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 18014021 - 2²² = 13819717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18014081) 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 as a sum of consecutive naturals, namely, 9007010 + 9007011.

It is an arithmetic number, because the mean of its divisors is an integer number (9007011).

Almost surely, 2^18014021 is an apocalyptic number.

It is an amenable number.

18014021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18014021 is an equidigital number, since it uses as much as digits as its factorization.

18014021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 18014021 is about 4244.2927561609. The cubic root of 18014021 is about 262.1421688252.

The spelling of 18014021 in words is "eighteen million, fourteen thousand, twenty-one".