21168448 has 28 divisors (see below), whose sum is σ = 48008032. Its totient is φ = 9072000.

The previous prime is 21168439. The next prime is 21168461. The reversal of 21168448 is 84486112.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

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, 23178 + ... + 24073.

Almost surely, 2^21168448 is an apocalyptic number.

21168448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21168448 is an abundant number, since it is smaller than the sum of its proper divisors (26839584).

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

21168448 is an equidigital number, since it uses as much as digits as its factorization.

21168448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47270 (or 47260 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 21168448 is about 4600.9181692354. The cubic root of 21168448 is about 276.6281290172.

The spelling of 21168448 in words is "twenty-one million, one hundred sixty-eight thousand, four hundred forty-eight".