21632889 has 4 divisors (see below), whose sum is σ = 28843856. Its totient is φ = 14421924.

The previous prime is 21632879. The next prime is 21632911. The reversal of 21632889 is 98823612.

It is a happy number.

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 21632889 - 2¹¹ = 21630841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21632839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3605479 + ... + 3605484.

It is an arithmetic number, because the mean of its divisors is an integer number (7210964).

Almost surely, 2^21632889 is an apocalyptic number.

It is an amenable number.

21632889 is a deficient number, since it is larger than the sum of its proper divisors (7210967).

21632889 is an equidigital number, since it uses as much as digits as its factorization.

21632889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7210966.

The product of its digits is 41472, while the sum is 39.

The square root of 21632889 is about 4651.1169626231. The cubic root of 21632889 is about 278.6366076094.

The spelling of 21632889 in words is "twenty-one million, six hundred thirty-two thousand, eight hundred eighty-nine".