21068608 has 28 divisors (see below), whose sum is σ = 45610272. Its totient is φ = 9576320.

The previous prime is 21068569. The next prime is 21068609. The reversal of 21068608 is 80686012.

It is a self number, because there is not a number n which added to its sum of digits gives 21068608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068609) 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, 14260 + ... + 15667.

Almost surely, 2^21068608 is an apocalyptic number.

It is an amenable number.

21068608 is an abundant number, since it is smaller than the sum of its proper divisors (24541664).

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

21068608 is a wasteful number, since it uses less digits than its factorization.

21068608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29950 (or 29940 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 21068608 is about 4590.0553373571. The cubic root of 21068608 is about 276.1925422566.

The spelling of 21068608 in words is "twenty-one million, sixty-eight thousand, six hundred eight".