21703265655 has 16 divisors (see below), whose sum is σ = 34752153984. Its totient is φ = 11566098720.

The previous prime is 21703265653. The next prime is 21703265693. The reversal of 21703265655 is 55656230712.

It is not a de Polignac number, because 21703265655 - 2¹ = 21703265653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703265653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541009 + ... + 579738.

It is an arithmetic number, because the mean of its divisors is an integer number (2172009624).

Almost surely, 2^21703265655 is an apocalyptic number.

21703265655 is a deficient number, since it is larger than the sum of its proper divisors (13048888329).

21703265655 is a wasteful number, since it uses less digits than its factorization.

21703265655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122046.

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 21703265655 in words is "twenty-one billion, seven hundred three million, two hundred sixty-five thousand, six hundred fifty-five".