21303268 has 24 divisors (see below), whose sum is σ = 43760192. Its totient is φ = 8882784.

The previous prime is 21303259. The next prime is 21303283. The reversal of 21303268 is 86230312.

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, 9246 + ... + 11317.

Almost surely, 2^21303268 is an apocalyptic number.

21303268 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21303268 is an abundant number, since it is smaller than the sum of its proper divisors (22456924).

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

21303268 is a wasteful number, since it uses less digits than its factorization.

21303268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20611 (or 20609 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21303268 is about 4615.5463381923. The cubic root of 21303268 is about 277.2141601252.

The spelling of 21303268 in words is "twenty-one million, three hundred three thousand, two hundred sixty-eight".