21825532 has 12 divisors (see below), whose sum is σ = 38363080. Its totient is φ = 10864656.

The previous prime is 21825521. The next prime is 21825533. The reversal of 21825532 is 23552812.

It is a self number, because there is not a number n which added to its sum of digits gives 21825532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825533) 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, 10998 + ... + 12829.

Almost surely, 2^21825532 is an apocalyptic number.

It is an amenable number.

21825532 is a deficient number, since it is larger than the sum of its proper divisors (16537548).

21825532 is a wasteful number, since it uses less digits than its factorization.

21825532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24060 (or 24058 counting only the distinct ones).

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

The square root of 21825532 is about 4671.7803886741. The cubic root of 21825532 is about 279.4612600090.

The spelling of 21825532 in words is "twenty-one million, eight hundred twenty-five thousand, five hundred thirty-two".