189423221 has 4 divisors (see below), whose sum is σ = 203994252. Its totient is φ = 174852192.

The previous prime is 189423203. The next prime is 189423233. The reversal of 189423221 is 122324981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122324981 = 43 ⋅2844767.

It can be written as a sum of positive squares in 2 ways, for example, as 54538225 + 134884996 = 7385^2 + 11614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189423221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189423281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7285496 + ... + 7285521.

It is an arithmetic number, because the mean of its divisors is an integer number (50998563).

Almost surely, 2^189423221 is an apocalyptic number.

It is an amenable number.

189423221 is a deficient number, since it is larger than the sum of its proper divisors (14571031).

189423221 is a wasteful number, since it uses less digits than its factorization.

189423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14571030.

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

The square root of 189423221 is about 13763.1108765424. The cubic root of 189423221 is about 574.3073913933.

The spelling of 189423221 in words is "one hundred eighty-nine million, four hundred twenty-three thousand, two hundred twenty-one".