21722618701 has 12 divisors (see below), whose sum is σ = 25290069852. Its totient is φ = 18603986688.

The previous prime is 21722618677. The next prime is 21722618707. The reversal of 21722618701 is 10781622712.

It can be written as a sum of positive squares in 2 ways, for example, as 5696324676 + 16026294025 = 75474^2 + 126595^2 .

It is not a de Polignac number, because 21722618701 - 2⁵ = 21722618669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722618707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123300 + ... + 242173.

It is an arithmetic number, because the mean of its divisors is an integer number (2107505821).

Almost surely, 2^21722618701 is an apocalyptic number.

It is an amenable number.

21722618701 is a deficient number, since it is larger than the sum of its proper divisors (3567451151).

21722618701 is a wasteful number, since it uses less digits than its factorization.

21722618701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366700 (or 366693 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 21722618701 in words is "twenty-one billion, seven hundred twenty-two million, six hundred eighteen thousand, seven hundred one".