21064662 has 24 divisors (see below), whose sum is σ = 46070856. Its totient is φ = 6955296.

The previous prime is 21064627. The next prime is 21064679. The reversal of 21064662 is 26646012.

It is a happy number.

21064662 is a `hidden beast` number, since 2 + 10 + 646 + 6 + 2 = 666.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 3543 + ... + 7394.

It is an arithmetic number, because the mean of its divisors is an integer number (1919619).

Almost surely, 2^21064662 is an apocalyptic number.

21064662 is an abundant number, since it is smaller than the sum of its proper divisors (25006194).

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

21064662 is a wasteful number, since it uses less digits than its factorization.

21064662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11052 (or 11049 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21064662 is about 4589.6254749162. The cubic root of 21064662 is about 276.1752982156.

The spelling of 21064662 in words is "twenty-one million, sixty-four thousand, six hundred sixty-two".