21525132 has 12 divisors (see below), whose sum is σ = 50225336. Its totient is φ = 7175040.

The previous prime is 21525121. The next prime is 21525139. The reversal of 21525132 is 23152512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21525099 and 21525108.

It is not an unprimeable number, because it can be changed into a prime (21525139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896869 + ... + 896892.

Almost surely, 2^21525132 is an apocalyptic number.

It is an amenable number.

21525132 is an abundant number, since it is smaller than the sum of its proper divisors (28700204).

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

21525132 is a wasteful number, since it uses less digits than its factorization.

21525132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793768 (or 1793766 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 21525132 is about 4639.5185095007. The cubic root of 21525132 is about 278.1731922886.

Adding to 21525132 its reverse (23152512), we get a palindrome (44677644).

The spelling of 21525132 in words is "twenty-one million, five hundred twenty-five thousand, one hundred thirty-two".