21500488 has 16 divisors (see below), whose sum is σ = 40527360. Its totient is φ = 10693200.

The previous prime is 21500483. The next prime is 21500489. The reversal of 21500488 is 88400512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5508 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (2532960).

Almost surely, 2^21500488 is an apocalyptic number.

It is an amenable number.

21500488 is a deficient number, since it is larger than the sum of its proper divisors (19026872).

21500488 is a wasteful number, since it uses less digits than its factorization.

21500488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14268 (or 14264 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 21500488 is about 4636.8618698426. The cubic root of 21500488 is about 278.0669921189.

The spelling of 21500488 in words is "twenty-one million, five hundred thousand, four hundred eighty-eight".