18335321 has 2 divisors, whose sum is σ = 18335322. Its totient is φ = 18335320.

The previous prime is 18335293. The next prime is 18335341. The reversal of 18335321 is 12353381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14478025 + 3857296 = 3805^2 + 1964^2 .

It is an emirp because it is prime and its reverse (12353381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18335321 - 2⁶ = 18335257 is a prime.

It is not a weakly prime, because it can be changed into another prime (18335341) 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, 9167660 + 9167661.

It is an arithmetic number, because the mean of its divisors is an integer number (9167661).

Almost surely, 2^18335321 is an apocalyptic number.

It is an amenable number.

18335321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18335321 is an equidigital number, since it uses as much as digits as its factorization.

18335321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 18335321 is about 4281.9762960577. The cubic root of 18335321 is about 263.6915254120.

The spelling of 18335321 in words is "eighteen million, three hundred thirty-five thousand, three hundred twenty-one".