21068879 has 8 divisors (see below), whose sum is σ = 22841952. Its totient is φ = 19317600.

The previous prime is 21068869. The next prime is 21068893. The reversal of 21068879 is 97886012.

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

It is a cyclic number.

It is not a de Polignac number, because 21068879 - 2¹² = 21064783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3404 + ... + 7329.

It is an arithmetic number, because the mean of its divisors is an integer number (2855244).

Almost surely, 2^21068879 is an apocalyptic number.

21068879 is a deficient number, since it is larger than the sum of its proper divisors (1773073).

21068879 is a wasteful number, since it uses less digits than its factorization.

21068879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10897.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 21068879 is about 4590.0848576034. The cubic root of 21068879 is about 276.1937264490.

The spelling of 21068879 in words is "twenty-one million, sixty-eight thousand, eight hundred seventy-nine".