21268312 has 24 divisors (see below), whose sum is σ = 43184340. Its totient is φ = 9815520.

The previous prime is 21268297. The next prime is 21268327. The reversal of 21268312 is 21386212.

It is an interprime number because it is at equal distance from previous prime (21268297) and next prime (21268327).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6514 + ... + 9217.

Almost surely, 2^21268312 is an apocalyptic number.

It is an amenable number.

21268312 is an abundant number, since it is smaller than the sum of its proper divisors (21916028).

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

21268312 is a wasteful number, since it uses less digits than its factorization.

21268312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15763 (or 15746 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 21268312 is about 4611.7580162016. The cubic root of 21268312 is about 277.0624525216.

The spelling of 21268312 in words is "twenty-one million, two hundred sixty-eight thousand, three hundred twelve".