21732248 has 16 divisors (see below), whose sum is σ = 41322960. Its totient is φ = 10712800.

The previous prime is 21732247. The next prime is 21732253. The reversal of 21732248 is 84223712.

It is a self number, because there is not a number n which added to its sum of digits gives 21732248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18563 + ... + 19698.

It is an arithmetic number, because the mean of its divisors is an integer number (2582685).

Almost surely, 2^21732248 is an apocalyptic number.

It is an amenable number.

21732248 is a deficient number, since it is larger than the sum of its proper divisors (19590712).

21732248 is a wasteful number, since it uses less digits than its factorization.

21732248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38338 (or 38334 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 21732248 is about 4661.7859238708. The cubic root of 21732248 is about 279.0625451262.

The spelling of 21732248 in words is "twenty-one million, seven hundred thirty-two thousand, two hundred forty-eight".