21332524 has 6 divisors (see below), whose sum is σ = 37331924. Its totient is φ = 10666260.

The previous prime is 21332503. The next prime is 21332527. The reversal of 21332524 is 42523312.

It is a junction number, because it is equal to n+sod(n) for n = 21332495 and 21332504.

It is not an unprimeable number, because it can be changed into a prime (21332527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666562 + ... + 2666569.

Almost surely, 2^21332524 is an apocalyptic number.

It is an amenable number.

21332524 is a deficient number, since it is larger than the sum of its proper divisors (15999400).

21332524 is a wasteful number, since it uses less digits than its factorization.

21332524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333135 (or 5333133 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 21332524 is about 4618.7145397827. The cubic root of 21332524 is about 277.3410024435.

Adding to 21332524 its reverse (42523312), we get a palindrome (63855836).

The spelling of 21332524 in words is "twenty-one million, three hundred thirty-two thousand, five hundred twenty-four".