21528088 has 8 divisors (see below), whose sum is σ = 40365180. Its totient is φ = 10764040.

The previous prime is 21528077. The next prime is 21528113. The reversal of 21528088 is 88082512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

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, 1345498 + ... + 1345513.

Almost surely, 2^21528088 is an apocalyptic number.

It is an amenable number.

21528088 is a deficient number, since it is larger than the sum of its proper divisors (18837092).

21528088 is a wasteful number, since it uses less digits than its factorization.

21528088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691017 (or 2691013 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 21528088 is about 4639.8370661048. The cubic root of 21528088 is about 278.1859253475.

The spelling of 21528088 in words is "twenty-one million, five hundred twenty-eight thousand, eighty-eight".