21148448 has 24 divisors (see below), whose sum is σ = 42981120. Its totient is φ = 10232640.

The previous prime is 21148427. The next prime is 21148481. The reversal of 21148448 is 84484112.

It is a Harshad number since it is a multiple of its sum of digits (32).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9668 + ... + 11651.

It is an arithmetic number, because the mean of its divisors is an integer number (1790880).

Almost surely, 2^21148448 is an apocalyptic number.

It is an amenable number.

21148448 is an abundant number, since it is smaller than the sum of its proper divisors (21832672).

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

21148448 is a wasteful number, since it uses less digits than its factorization.

21148448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21360 (or 21352 counting only the distinct ones).

The product of its digits is 8192, while the sum is 32.

The square root of 21148448 is about 4598.7441764029. The cubic root of 21148448 is about 276.5409819278.

The spelling of 21148448 in words is "twenty-one million, one hundred forty-eight thousand, four hundred forty-eight".