21365665022 has 16 divisors (see below), whose sum is σ = 35446572672. Its totient is φ = 9594560160.

The previous prime is 21365665019. The next prime is 21365665043. The reversal of 21365665022 is 22056656312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11103854 + ... + 11105777.

It is an arithmetic number, because the mean of its divisors is an integer number (2215410792).

Almost surely, 2^21365665022 is an apocalyptic number.

21365665022 is a deficient number, since it is larger than the sum of its proper divisors (14080907650).

21365665022 is a wasteful number, since it uses less digits than its factorization.

21365665022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22209683.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 21365665022 in words is "twenty-one billion, three hundred sixty-five million, six hundred sixty-five thousand, twenty-two".