21536532 has 36 divisors (see below), whose sum is σ = 54958176. Its totient is φ = 7110480.

The previous prime is 21536527. The next prime is 21536539. The reversal of 21536532 is 23563512.

21536532 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 653 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21536496 and 21536505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21536539) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1057 + ... + 6647.

It is an arithmetic number, because the mean of its divisors is an integer number (1526616).

Almost surely, 2^21536532 is an apocalyptic number.

It is an amenable number.

21536532 is an abundant number, since it is smaller than the sum of its proper divisors (33421644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21536532 is a wasteful number, since it uses less digits than its factorization.

21536532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5708 (or 5703 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 21536532 is about 4640.7469226408. The cubic root of 21536532 is about 278.2222917123. Note that the first 4 decimals are identical.

The spelling of 21536532 in words is "twenty-one million, five hundred thirty-six thousand, five hundred thirty-two".