21468844 has 12 divisors (see below), whose sum is σ = 39204144. Its totient is φ = 10267664.

The previous prime is 21468829. The next prime is 21468899. The reversal of 21468844 is 44886412.

It is a super-2 number, since 2×21468844² = 921822525392672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116587 + ... + 116770.

It is an arithmetic number, because the mean of its divisors is an integer number (3267012).

Almost surely, 2^21468844 is an apocalyptic number.

It is an amenable number.

21468844 is a deficient number, since it is larger than the sum of its proper divisors (17735300).

21468844 is a wasteful number, since it uses less digits than its factorization.

21468844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233384 (or 233382 counting only the distinct ones).

The product of its digits is 49152, while the sum is 37.

The square root of 21468844 is about 4633.4483918568. The cubic root of 21468844 is about 277.9305072751.

The spelling of 21468844 in words is "twenty-one million, four hundred sixty-eight thousand, eight hundred forty-four".