21067386 has 16 divisors (see below), whose sum is σ = 44613504. Its totient is φ = 6609344.

The previous prime is 21067357. The next prime is 21067391. The reversal of 21067386 is 68376012.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 103170 + ... + 103373.

It is an arithmetic number, because the mean of its divisors is an integer number (2788344).

Almost surely, 2^21067386 is an apocalyptic number.

21067386 is an abundant number, since it is smaller than the sum of its proper divisors (23546118).

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

21067386 is a wasteful number, since it uses less digits than its factorization.

21067386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206565.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21067386 is about 4589.9222215632. The cubic root of 21067386 is about 276.1872023403.

The spelling of 21067386 in words is "twenty-one million, sixty-seven thousand, three hundred eighty-six".