189021 has 8 divisors (see below), whose sum is σ = 288064. Its totient is φ = 108000.

The previous prime is 189019. The next prime is 189041. The reversal of 189021 is 120981.

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

It is not a de Polignac number, because 189021 - 2¹ = 189019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 9001 = 189021 / (1 + 8 + 9 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189011) 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, 4480 + ... + 4521.

It is an arithmetic number, because the mean of its divisors is an integer number (36008).

2¹⁸⁹⁰²¹ is an apocalyptic number.

It is an amenable number.

189021 is a deficient number, since it is larger than the sum of its proper divisors (99043).

189021 is an equidigital number, since it uses as much as digits as its factorization.

189021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9011.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 189021 is about 434.7654540094. The cubic root of 189021 is about 57.3900608835.

The spelling of 189021 in words is "one hundred eighty-nine thousand, twenty-one".