21082766 has 12 divisors (see below), whose sum is σ = 33060552. Its totient is φ = 10082556.

The previous prime is 21082757. The next prime is 21082777. The reversal of 21082766 is 66728012.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 8906 + ... + 11021.

It is an arithmetic number, because the mean of its divisors is an integer number (2755046).

Almost surely, 2^21082766 is an apocalyptic number.

21082766 is a deficient number, since it is larger than the sum of its proper divisors (11977786).

21082766 is a wasteful number, since it uses less digits than its factorization.

21082766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19975 (or 19952 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 21082766 is about 4591.5973255502. The cubic root of 21082766 is about 276.2543950762.

The spelling of 21082766 in words is "twenty-one million, eighty-two thousand, seven hundred sixty-six".