21876189 has 4 divisors (see below), whose sum is σ = 29168256. Its totient is φ = 14584124.

The previous prime is 21876181. The next prime is 21876199. The reversal of 21876189 is 98167812.

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 a cyclic number.

It is not a de Polignac number, because 21876189 - 2³ = 21876181 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21876189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21876181) 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, 3646029 + ... + 3646034.

It is an arithmetic number, because the mean of its divisors is an integer number (7292064).

Almost surely, 2^21876189 is an apocalyptic number.

It is an amenable number.

21876189 is a deficient number, since it is larger than the sum of its proper divisors (7292067).

21876189 is an equidigital number, since it uses as much as digits as its factorization.

21876189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7292066.

The product of its digits is 48384, while the sum is 42.

The square root of 21876189 is about 4677.1988411869. The cubic root of 21876189 is about 279.6773025567.

The spelling of 21876189 in words is "twenty-one million, eight hundred seventy-six thousand, one hundred eighty-nine".