21288548 has 12 divisors (see below), whose sum is σ = 37540272. Its totient is φ = 10562760.

The previous prime is 21288529. The next prime is 21288551. The reversal of 21288548 is 84588212.

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 in 3 ways as a sum of consecutive naturals, for example, 19790 + ... + 20837.

It is an arithmetic number, because the mean of its divisors is an integer number (3128356).

Almost surely, 2^21288548 is an apocalyptic number.

It is an amenable number.

21288548 is a deficient number, since it is larger than the sum of its proper divisors (16251724).

21288548 is a wasteful number, since it uses less digits than its factorization.

21288548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40762 (or 40760 counting only the distinct ones).

The product of its digits is 40960, while the sum is 38.

The square root of 21288548 is about 4613.9514518469. The cubic root of 21288548 is about 277.1502961731.

The spelling of 21288548 in words is "twenty-one million, two hundred eighty-eight thousand, five hundred forty-eight".