21268208 has 20 divisors (see below), whose sum is σ = 44377368. Its totient is φ = 9816000.

The previous prime is 21268193. The next prime is 21268213. The reversal of 21268208 is 80286212.

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, 50918 + ... + 51333.

Almost surely, 2^21268208 is an apocalyptic number.

It is an amenable number.

21268208 is an abundant number, since it is smaller than the sum of its proper divisors (23109160).

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

21268208 is a wasteful number, since it uses less digits than its factorization.

21268208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102272 (or 102266 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 21268208 is about 4611.7467406613. The cubic root of 21268208 is about 277.0620009180.

The spelling of 21268208 in words is "twenty-one million, two hundred sixty-eight thousand, two hundred eight".