21232896 has 36 divisors (see below), whose sum is σ = 56512512. Its totient is φ = 7077376.

The previous prime is 21232879. The next prime is 21232919. The reversal of 21232896 is 69823212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13056 + ... + 14591.

It is an arithmetic number, because the mean of its divisors is an integer number (1569792).

Almost surely, 2^21232896 is an apocalyptic number.

It is an amenable number.

21232896 is an abundant number, since it is smaller than the sum of its proper divisors (35279616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232896 is an equidigital number, since it uses as much as digits as its factorization.

21232896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27666 (or 27652 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 21232896 is about 4607.9166659131. The cubic root of 21232896 is about 276.9085789181.

The spelling of 21232896 in words is "twenty-one million, two hundred thirty-two thousand, eight hundred ninety-six".