21253296 has 20 divisors (see below), whose sum is σ = 54904472. Its totient is φ = 7084416.

The previous prime is 21253279. The next prime is 21253301. The reversal of 21253296 is 69235212.

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, 221341 + ... + 221436.

Almost surely, 2^21253296 is an apocalyptic number.

It is an amenable number.

21253296 is an abundant number, since it is smaller than the sum of its proper divisors (33651176).

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

21253296 is a wasteful number, since it uses less digits than its factorization.

21253296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442788 (or 442782 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 21253296 is about 4610.1297161794. The cubic root of 21253296 is about 276.9972326571.

The spelling of 21253296 in words is "twenty-one million, two hundred fifty-three thousand, two hundred ninety-six".