189321821 has 8 divisors (see below), whose sum is σ = 205492224. Its totient is φ = 173381040.

The previous prime is 189321817. The next prime is 189321827. The reversal of 189321821 is 128123981.

189321821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189321821 - 2² = 189321817 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 (189321827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55685 + ... + 58986.

It is an arithmetic number, because the mean of its divisors is an integer number (25686528).

Almost surely, 2^189321821 is an apocalyptic number.

It is an amenable number.

189321821 is a deficient number, since it is larger than the sum of its proper divisors (16170403).

189321821 is a wasteful number, since it uses less digits than its factorization.

189321821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114811.

The product of its digits is 6912, while the sum is 35.

The square root of 189321821 is about 13759.4266232282. The cubic root of 189321821 is about 574.2048957516.

The spelling of 189321821 in words is "one hundred eighty-nine million, three hundred twenty-one thousand, eight hundred twenty-one".