21068386 has 8 divisors (see below), whose sum is σ = 31792320. Its totient is φ = 10470948.

The previous prime is 21068357. The next prime is 21068417. The reversal of 21068386 is 68386012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31206 + ... + 31873.

It is an arithmetic number, because the mean of its divisors is an integer number (3974040).

Almost surely, 2^21068386 is an apocalyptic number.

21068386 is a deficient number, since it is larger than the sum of its proper divisors (10723934).

21068386 is a wasteful number, since it uses less digits than its factorization.

21068386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63248.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21068386 is about 4590.0311545784. The cubic root of 21068386 is about 276.1915721726.

The spelling of 21068386 in words is "twenty-one million, sixty-eight thousand, three hundred eighty-six".