21723565722 has 32 divisors (see below), whose sum is σ = 44428372992. Its totient is φ = 7078043184.

The previous prime is 21723565691. The next prime is 21723565727. The reversal of 21723565722 is 22756532712.

It is not an unprimeable number, because it can be changed into a prime (21723565727) 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, 172993 + ... + 270875.

It is an arithmetic number, because the mean of its divisors is an integer number (1388386656).

Almost surely, 2^21723565722 is an apocalyptic number.

21723565722 is an abundant number, since it is smaller than the sum of its proper divisors (22704807270).

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

21723565722 is a wasteful number, since it uses less digits than its factorization.

21723565722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98722.

The product of its digits is 352800, while the sum is 42.

The spelling of 21723565722 in words is "twenty-one billion, seven hundred twenty-three million, five hundred sixty-five thousand, seven hundred twenty-two".