21703267865 has 32 divisors (see below), whose sum is σ = 27249868800. Its totient is φ = 16574535360.

The previous prime is 21703267849. The next prime is 21703267867. The reversal of 21703267865 is 56876230712.

It is not a de Polignac number, because 21703267865 - 2⁴ = 21703267849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21703267867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16453676 + ... + 16454994.

It is an arithmetic number, because the mean of its divisors is an integer number (851558400).

Almost surely, 2^21703267865 is an apocalyptic number.

It is an amenable number.

21703267865 is a deficient number, since it is larger than the sum of its proper divisors (5546600935).

21703267865 is a wasteful number, since it uses less digits than its factorization.

21703267865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 21703267865 in words is "twenty-one billion, seven hundred three million, two hundred sixty-seven thousand, eight hundred sixty-five".