21359668 has 12 divisors (see below), whose sum is σ = 40777632. Its totient is φ = 9708920.

The previous prime is 21359659. The next prime is 21359671. The reversal of 21359668 is 86695312.

It is a self number, because there is not a number n which added to its sum of digits gives 21359668.

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, 242680 + ... + 242767.

It is an arithmetic number, because the mean of its divisors is an integer number (3398136).

Almost surely, 2^21359668 is an apocalyptic number.

It is an amenable number.

21359668 is a deficient number, since it is larger than the sum of its proper divisors (19417964).

21359668 is a wasteful number, since it uses less digits than its factorization.

21359668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485462 (or 485460 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 21359668 is about 4621.6520855642. The cubic root of 21359668 is about 277.4585843016.

The spelling of 21359668 in words is "twenty-one million, three hundred fifty-nine thousand, six hundred sixty-eight".