21248448 has 56 divisors (see below), whose sum is σ = 60551568. Its totient is φ = 6537216.

The previous prime is 21248431. The next prime is 21248473. The reversal of 21248448 is 84484212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1761 + ... + 6752.

It is an arithmetic number, because the mean of its divisors is an integer number (1081278).

Almost surely, 2^21248448 is an apocalyptic number.

It is an amenable number.

21248448 is an abundant number, since it is smaller than the sum of its proper divisors (39303120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21248448 is a wasteful number, since it uses less digits than its factorization.

21248448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8541 (or 8531 counting only the distinct ones).

The product of its digits is 16384, while the sum is 33.

The square root of 21248448 is about 4609.6038875374. The cubic root of 21248448 is about 276.9761694974.

The spelling of 21248448 in words is "twenty-one million, two hundred forty-eight thousand, four hundred forty-eight".