21268568 has 16 divisors (see below), whose sum is σ = 39933000. Its totient is φ = 10619776.

The previous prime is 21268567. The next prime is 21268579. The reversal of 21268568 is 86586212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21268567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6848 + ... + 9456.

Almost surely, 2^21268568 is an apocalyptic number.

It is an amenable number.

21268568 is a deficient number, since it is larger than the sum of its proper divisors (18664432).

21268568 is a wasteful number, since it uses less digits than its factorization.

21268568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634 (or 3630 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 21268568 is about 4611.7857712604. The cubic root of 21268568 is about 277.0635641551.

The spelling of 21268568 in words is "twenty-one million, two hundred sixty-eight thousand, five hundred sixty-eight".