21225532 has 12 divisors (see below), whose sum is σ = 37180360. Its totient is φ = 10602576.

The previous prime is 21225511. The next prime is 21225541. The reversal of 21225532 is 23552212.

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, 4018 + ... + 7654.

Almost surely, 2^21225532 is an apocalyptic number.

It is an amenable number.

21225532 is a deficient number, since it is larger than the sum of its proper divisors (15954828).

21225532 is a wasteful number, since it uses less digits than its factorization.

21225532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100 (or 5098 counting only the distinct ones).

The product of its digits is 1200, while the sum is 22.

The square root of 21225532 is about 4607.1175370290. The cubic root of 21225532 is about 276.8765627083.

Adding to 21225532 its reverse (23552212), we get a palindrome (44777744).

The spelling of 21225532 in words is "twenty-one million, two hundred twenty-five thousand, five hundred thirty-two".