18352021 has 2 divisors, whose sum is σ = 18352022. Its totient is φ = 18352020.

The previous prime is 18352001. The next prime is 18352039. The reversal of 18352021 is 12025381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13793796 + 4558225 = 3714^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 18352021 - 2⁵ = 18351989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18351983 and 18352001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18352001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9176010 + 9176011.

It is an arithmetic number, because the mean of its divisors is an integer number (9176011).

Almost surely, 2^18352021 is an apocalyptic number.

It is an amenable number.

18352021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18352021 is an equidigital number, since it uses as much as digits as its factorization.

18352021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18352021 is about 4283.9258863804. The cubic root of 18352021 is about 263.7715587747.

The spelling of 18352021 in words is "eighteen million, three hundred fifty-two thousand, twenty-one".