21812896 has 24 divisors (see below), whose sum is σ = 49079520. Its totient is φ = 9348288.

The previous prime is 21812891. The next prime is 21812899. The reversal of 21812896 is 69821812.

It is not an unprimeable number, because it can be changed into a prime (21812891) by changing a digit.

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, 48466 + ... + 48913.

It is an arithmetic number, because the mean of its divisors is an integer number (2044980).

Almost surely, 2^21812896 is an apocalyptic number.

It is an amenable number.

21812896 is an abundant number, since it is smaller than the sum of its proper divisors (27266624).

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

21812896 is an equidigital number, since it uses as much as digits as its factorization.

21812896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97396 (or 97388 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 21812896 is about 4670.4278176630. The cubic root of 21812896 is about 279.4073177701.

The spelling of 21812896 in words is "twenty-one million, eight hundred twelve thousand, eight hundred ninety-six".