21882089 has 4 divisors (see below), whose sum is σ = 21891456. Its totient is φ = 21872724.

The previous prime is 21882083. The next prime is 21882101. The reversal of 21882089 is 98028812.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21882089 - 2⁴ = 21882073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21882083) 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, 2012 + ... + 6914.

It is an arithmetic number, because the mean of its divisors is an integer number (5472864).

Almost surely, 2^21882089 is an apocalyptic number.

It is an amenable number.

21882089 is a deficient number, since it is larger than the sum of its proper divisors (9367).

21882089 is an equidigital number, since it uses as much as digits as its factorization.

21882089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9366.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 21882089 is about 4677.8295180564. The cubic root of 21882089 is about 279.7024432514.

The spelling of 21882089 in words is "twenty-one million, eight hundred eighty-two thousand, eighty-nine".