21443384 has 16 divisors (see below), whose sum is σ = 40257000. Its totient is φ = 10708192.

The previous prime is 21443363. The next prime is 21443431. The reversal of 21443384 is 48334412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9167 + ... + 11265.

Almost surely, 2^21443384 is an apocalyptic number.

It is an amenable number.

21443384 is a deficient number, since it is larger than the sum of its proper divisors (18813616).

21443384 is a wasteful number, since it uses less digits than its factorization.

21443384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3382 (or 3378 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 21443384 is about 4630.7001630423. The cubic root of 21443384 is about 277.8205974642.

Adding to 21443384 its reverse (48334412), we get a palindrome (69777796).

The spelling of 21443384 in words is "twenty-one million, four hundred forty-three thousand, three hundred eighty-four".