21732488 has 16 divisors (see below), whose sum is σ = 42063360. Its totient is φ = 10515600.

The previous prime is 21732481. The next prime is 21732497. The reversal of 21732488 is 88423712.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732481) by changing a digit.

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, 43568 + ... + 44063.

It is an arithmetic number, because the mean of its divisors is an integer number (2628960).

Almost surely, 2^21732488 is an apocalyptic number.

It is an amenable number.

21732488 is a deficient number, since it is larger than the sum of its proper divisors (20330872).

21732488 is a wasteful number, since it uses less digits than its factorization.

21732488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87668 (or 87664 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 21732488 is about 4661.8116650075. The cubic root of 21732488 is about 279.0635723978.

The spelling of 21732488 in words is "twenty-one million, seven hundred thirty-two thousand, four hundred eighty-eight".