21125100189 has 4 divisors (see below), whose sum is σ = 28166800256. Its totient is φ = 14083400124.

The previous prime is 21125100179. The next prime is 21125100209. The reversal of 21125100189 is 98100152112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21125100189 - 2¹⁵ = 21125067421 is a prime.

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 (21125100169) 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, 3520850029 + ... + 3520850034.

It is an arithmetic number, because the mean of its divisors is an integer number (7041700064).

Almost surely, 2^21125100189 is an apocalyptic number.

It is an amenable number.

21125100189 is a deficient number, since it is larger than the sum of its proper divisors (7041700067).

21125100189 is an equidigital number, since it uses as much as digits as its factorization.

21125100189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041700066.

The product of its (nonzero) digits is 1440, while the sum is 30.

The spelling of 21125100189 in words is "twenty-one billion, one hundred twenty-five million, one hundred thousand, one hundred eighty-nine".