21066682 has 16 divisors (see below), whose sum is σ = 38892672. Its totient is φ = 8334000.

The previous prime is 21066679. The next prime is 21066691. The reversal of 21066682 is 28666012.

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, 57694 + ... + 58057.

It is an arithmetic number, because the mean of its divisors is an integer number (2430792).

Almost surely, 2^21066682 is an apocalyptic number.

21066682 is a deficient number, since it is larger than the sum of its proper divisors (17825990).

21066682 is a wasteful number, since it uses less digits than its factorization.

21066682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115773.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21066682 is about 4589.8455311699. The cubic root of 21066682 is about 276.1841258954.

The spelling of 21066682 in words is "twenty-one million, sixty-six thousand, six hundred eighty-two".