21245448 has 32 divisors (see below), whose sum is σ = 60701760. Its totient is φ = 6070080.

The previous prime is 21245417. The next prime is 21245459. The reversal of 21245448 is 84454212.

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, 63063 + ... + 63398.

It is an arithmetic number, because the mean of its divisors is an integer number (1896930).

Almost surely, 2^21245448 is an apocalyptic number.

21245448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21245448 is an abundant number, since it is smaller than the sum of its proper divisors (39456312).

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

21245448 is a wasteful number, since it uses less digits than its factorization.

21245448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126477 (or 126473 counting only the distinct ones).

The product of its digits is 10240, while the sum is 30.

The square root of 21245448 is about 4609.2784684807. The cubic root of 21245448 is about 276.9631337592.

The spelling of 21245448 in words is "twenty-one million, two hundred forty-five thousand, four hundred forty-eight".