21489584 has 20 divisors (see below), whose sum is σ = 42106680. Its totient is φ = 10623360.

The previous prime is 21489583. The next prime is 21489599. The reversal of 21489584 is 48598412.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21489583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6122 + ... + 8969.

It is an arithmetic number, because the mean of its divisors is an integer number (2105334).

Almost surely, 2^21489584 is an apocalyptic number.

It is an amenable number.

21489584 is a deficient number, since it is larger than the sum of its proper divisors (20617096).

21489584 is a wasteful number, since it uses less digits than its factorization.

21489584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15188 (or 15182 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 21489584 is about 4635.6859255131. The cubic root of 21489584 is about 278.0199768264.

It can be divided in two parts, 214 and 89584, that added together give a palindrome (89798).

The spelling of 21489584 in words is "twenty-one million, four hundred eighty-nine thousand, five hundred eighty-four".