21453248 has 14 divisors (see below), whose sum is σ = 42571416. Its totient is φ = 10726592.

The previous prime is 21453247. The next prime is 21453251. The reversal of 21453248 is 84235412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21453248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21453247) 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 as a sum of consecutive naturals, namely, 167540 + ... + 167667.

Almost surely, 2^21453248 is an apocalyptic number.

It is an amenable number.

21453248 is a deficient number, since it is larger than the sum of its proper divisors (21118168).

21453248 is an equidigital number, since it uses as much as digits as its factorization.

21453248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335219 (or 335209 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 21453248 is about 4631.7651063067. The cubic root of 21453248 is about 277.8631902794.

The spelling of 21453248 in words is "twenty-one million, four hundred fifty-three thousand, two hundred forty-eight".