189416221 has 2 divisors, whose sum is σ = 189416222. Its totient is φ = 189416220.

The previous prime is 189416207. The next prime is 189416267. The reversal of 189416221 is 122614981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188760121 + 656100 = 13739^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 189416221 - 2¹³ = 189408029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189416281) 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, 94708110 + 94708111.

It is an arithmetic number, because the mean of its divisors is an integer number (94708111).

Almost surely, 2^189416221 is an apocalyptic number.

It is an amenable number.

189416221 is a deficient number, since it is larger than the sum of its proper divisors (1).

189416221 is an equidigital number, since it uses as much as digits as its factorization.

189416221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 189416221 is about 13762.8565712210. The cubic root of 189416221 is about 574.3003169328.

The spelling of 189416221 in words is "one hundred eighty-nine million, four hundred sixteen thousand, two hundred twenty-one".