21449552 has 20 divisors (see below), whose sum is σ = 42241716. Its totient is φ = 10548480.

The previous prime is 21449539. The next prime is 21449599. The reversal of 21449552 is 25594412.

It can be written as a sum of positive squares in 2 ways, for example, as 4343056 + 17106496 = 2084^2 + 4136^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10013 + ... + 11964.

Almost surely, 2^21449552 is an apocalyptic number.

It is an amenable number.

21449552 is a deficient number, since it is larger than the sum of its proper divisors (20792164).

21449552 is a wasteful number, since it uses less digits than its factorization.

21449552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22046 (or 22040 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 21449552 is about 4631.3661051573. The cubic root of 21449552 is about 277.8472324575.

The spelling of 21449552 in words is "twenty-one million, four hundred forty-nine thousand, five hundred fifty-two".