21068568 has 48 divisors (see below), whose sum is σ = 60067800. Its totient is φ = 6652800.

The previous prime is 21068563. The next prime is 21068569. The reversal of 21068568 is 86586012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6333 + ... + 9068.

Almost surely, 2^21068568 is an apocalyptic number.

It is an amenable number.

21068568 is an abundant number, since it is smaller than the sum of its proper divisors (38999232).

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

21068568 is a wasteful number, since it uses less digits than its factorization.

21068568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15432 (or 15425 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 21068568 is about 4590.0509801090. The cubic root of 21068568 is about 276.1923674672.

The spelling of 21068568 in words is "twenty-one million, sixty-eight thousand, five hundred sixty-eight".