189455021 has 16 divisors (see below), whose sum is σ = 233942400. Its totient is φ = 152832960.

The previous prime is 189455017. The next prime is 189455039. The reversal of 189455021 is 120554981.

It is not a de Polignac number, because 189455021 - 2² = 189455017 is a prime.

It is a super-2 number, since 2×189455021² = 71786409964220882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189455011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10415 + ... + 22076.

It is an arithmetic number, because the mean of its divisors is an integer number (14621400).

Almost surely, 2^189455021 is an apocalyptic number.

It is an amenable number.

189455021 is a deficient number, since it is larger than the sum of its proper divisors (44487379).

189455021 is an equidigital number, since it uses as much as digits as its factorization.

189455021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32529 (or 32515 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 189455021 is about 13764.2660901335. The cubic root of 189455021 is about 574.3395274624.

The spelling of 189455021 in words is "one hundred eighty-nine million, four hundred fifty-five thousand, twenty-one".