189324221 has 2 divisors, whose sum is σ = 189324222. Its totient is φ = 189324220.

The previous prime is 189324169. The next prime is 189324251. The reversal of 189324221 is 122423981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171976996 + 17347225 = 13114^2 + 4165^2 .

It is an emirp because it is prime and its reverse (122423981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189324221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189324251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94662110 + 94662111.

It is an arithmetic number, because the mean of its divisors is an integer number (94662111).

Almost surely, 2^189324221 is an apocalyptic number.

It is an amenable number.

189324221 is a deficient number, since it is larger than the sum of its proper divisors (1).

189324221 is an equidigital number, since it uses as much as digits as its factorization.

189324221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 189324221 is about 13759.5138358882. The cubic root of 189324221 is about 574.2073221067.

It can be divided in two parts, 18 and 9324221, that added together give a palindrome (9324239).

The spelling of 189324221 in words is "one hundred eighty-nine million, three hundred twenty-four thousand, two hundred twenty-one".