21522232 has 16 divisors (see below), whose sum is σ = 40841640. Its totient is φ = 10631136.

The previous prime is 21522223. The next prime is 21522251. The reversal of 21522232 is 23222512.

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, 15543 + ... + 16870.

Almost surely, 2^21522232 is an apocalyptic number.

It is an amenable number.

21522232 is a deficient number, since it is larger than the sum of its proper divisors (19319408).

21522232 is a wasteful number, since it uses less digits than its factorization.

21522232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32502 (or 32498 counting only the distinct ones).

The product of its digits is 480, while the sum is 19.

The square root of 21522232 is about 4639.2059665421. The cubic root of 21522232 is about 278.1606993186.

Adding to 21522232 its reverse (23222512), we get a palindrome (44744744).

The spelling of 21522232 in words is "twenty-one million, five hundred twenty-two thousand, two hundred thirty-two".