21444552 has 24 divisors (see below), whose sum is σ = 58079190. Its totient is φ = 7148160.

The previous prime is 21444541. The next prime is 21444581. The reversal of 21444552 is 25544412.

21444552 is a `hidden beast` number, since 214 + 445 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13793796 + 7650756 = 3714^2 + 2766^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a plaindrome in base 13.

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 5 ways as a sum of consecutive naturals, for example, 148849 + ... + 148992.

Almost surely, 2^21444552 is an apocalyptic number.

It is an amenable number.

21444552 is an abundant number, since it is smaller than the sum of its proper divisors (36634638).

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

21444552 is a wasteful number, since it uses less digits than its factorization.

21444552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297853 (or 297846 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 21444552 is about 4630.8262761628. The cubic root of 21444552 is about 277.8256415773.

Adding to 21444552 its reverse (25544412), we get a palindrome (46988964).

The spelling of 21444552 in words is "twenty-one million, four hundred forty-four thousand, five hundred fifty-two".