21323552 has 24 divisors (see below), whose sum is σ = 42359436. Its totient is φ = 10565632.

The previous prime is 21323531. The next prime is 21323591. The reversal of 21323552 is 25532312.

It can be written as a sum of positive squares in 2 ways, for example, as 21196816 + 126736 = 4604^2 + 356^2 .

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, 668 + ... + 6564.

Almost surely, 2^21323552 is an apocalyptic number.

It is an amenable number.

21323552 is a deficient number, since it is larger than the sum of its proper divisors (21035884).

21323552 is a wasteful number, since it uses less digits than its factorization.

21323552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6020 (or 6012 counting only the distinct ones).

The product of its digits is 1800, while the sum is 23.

The square root of 21323552 is about 4617.7431717236. The cubic root of 21323552 is about 277.3021157745.

Adding to 21323552 its reverse (25532312), we get a palindrome (46855864).

The spelling of 21323552 in words is "twenty-one million, three hundred twenty-three thousand, five hundred fifty-two".