21360544 has 24 divisors (see below), whose sum is σ = 43192548. Its totient is φ = 10391040.

The previous prime is 21360533. The next prime is 21360571. The reversal of 21360544 is 44506312.

It can be written as a sum of positive squares in 2 ways, for example, as 21270544 + 90000 = 4612^2 + 300^2 .

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, 7837 + ... + 10204.

Almost surely, 2^21360544 is an apocalyptic number.

It is an amenable number.

21360544 is an abundant number, since it is smaller than the sum of its proper divisors (21832004).

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

21360544 is a wasteful number, since it uses less digits than its factorization.

21360544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18088 (or 18080 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21360544 is about 4621.7468558977. The cubic root of 21360544 is about 277.4623772818.

Adding to 21360544 its reverse (44506312), we get a palindrome (65866856).

It can be divided in two parts, 21360 and 544, that added together give a square (21904 = 148²).

The spelling of 21360544 in words is "twenty-one million, three hundred sixty thousand, five hundred forty-four".