21722441705 has 4 divisors (see below), whose sum is σ = 26066930052. Its totient is φ = 17377953360.

The previous prime is 21722441683. The next prime is 21722441707. The reversal of 21722441705 is 50714422712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2474764009 + 19247677696 = 49747^2 + 138736^2 .

It is not a de Polignac number, because 21722441705 - 2⁶ = 21722441641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21722441707) 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 3 ways as a sum of consecutive naturals, for example, 2172244166 + ... + 2172244175.

It is an arithmetic number, because the mean of its divisors is an integer number (6516732513).

Almost surely, 2^21722441705 is an apocalyptic number.

It is an amenable number.

21722441705 is a deficient number, since it is larger than the sum of its proper divisors (4344488347).

21722441705 is an equidigital number, since it uses as much as digits as its factorization.

21722441705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344488346.

The product of its (nonzero) digits is 31360, while the sum is 35.

The spelling of 21722441705 in words is "twenty-one billion, seven hundred twenty-two million, four hundred forty-one thousand, seven hundred five".