21448924 has 24 divisors (see below), whose sum is σ = 42997248. Its totient is φ = 9171120.

The previous prime is 21448913. The next prime is 21448927. The reversal of 21448924 is 42984412.

It is a self number, because there is not a number n which added to its sum of digits gives 21448924.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21448927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20289 + ... + 21319.

It is an arithmetic number, because the mean of its divisors is an integer number (1791552).

Almost surely, 2^21448924 is an apocalyptic number.

It is an amenable number.

21448924 is an abundant number, since it is smaller than the sum of its proper divisors (21548324).

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

21448924 is a wasteful number, since it uses less digits than its factorization.

21448924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785 (or 1783 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 21448924 is about 4631.2983060909. The cubic root of 21448924 is about 277.8445208272.

The spelling of 21448924 in words is "twenty-one million, four hundred forty-eight thousand, nine hundred twenty-four".