21448844 has 24 divisors (see below), whose sum is σ = 38407488. Its totient is φ = 10478160.

The previous prime is 21448841. The next prime is 21448859. The reversal of 21448844 is 44884412.

21448844 is a modest number, since divided by 8844 gives 2144 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21448841) 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, 43439 + ... + 43929.

It is an arithmetic number, because the mean of its divisors is an integer number (1600312).

Almost surely, 2^21448844 is an apocalyptic number.

It is an amenable number.

21448844 is a deficient number, since it is larger than the sum of its proper divisors (16958644).

21448844 is a wasteful number, since it uses less digits than its factorization.

21448844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725 (or 723 counting only the distinct ones).

The product of its digits is 32768, while the sum is 35.

The square root of 21448844 is about 4631.2896691958. The cubic root of 21448844 is about 277.8441753928.

The spelling of 21448844 in words is "twenty-one million, four hundred forty-eight thousand, eight hundred forty-four".