21532528 has 10 divisors (see below), whose sum is σ = 41719304. Its totient is φ = 10766256.

The previous prime is 21532519. The next prime is 21532541. The reversal of 21532528 is 82523512.

It is a junction number, because it is equal to n+sod(n) for n = 21532496 and 21532505.

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 as a sum of consecutive naturals, namely, 672876 + ... + 672907.

Almost surely, 2^21532528 is an apocalyptic number.

It is an amenable number.

21532528 is a deficient number, since it is larger than the sum of its proper divisors (20186776).

21532528 is a wasteful number, since it uses less digits than its factorization.

21532528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345791 (or 1345785 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 21532528 is about 4640.3155065146. The cubic root of 21532528 is about 278.2050485910.

The spelling of 21532528 in words is "twenty-one million, five hundred thirty-two thousand, five hundred twenty-eight".