21444368 has 20 divisors (see below), whose sum is σ = 45325968. Its totient is φ = 9747360.

The previous prime is 21444347. The next prime is 21444373. The reversal of 21444368 is 86344412.

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, 60746 + ... + 61097.

Almost surely, 2^21444368 is an apocalyptic number.

It is an amenable number.

21444368 is an abundant number, since it is smaller than the sum of its proper divisors (23881600).

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

21444368 is a wasteful number, since it uses less digits than its factorization.

21444368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121862 (or 121856 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The square root of 21444368 is about 4630.8064092553. The cubic root of 21444368 is about 277.8248469689.

It can be divided in two parts, 21444 and 368, that added together give a palindrome (21812).

The spelling of 21444368 in words is "twenty-one million, four hundred forty-four thousand, three hundred sixty-eight".