22171721705 has 32 divisors (see below), whose sum is σ = 31130313984. Its totient is φ = 14842146816.

The previous prime is 22171721639. The next prime is 22171721707. The reversal of 22171721705 is 50712717122.

It is not a de Polignac number, because 22171721705 - 2⁸ = 22171721449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (22171721707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5441549 + ... + 5445621.

It is an arithmetic number, because the mean of its divisors is an integer number (972822312).

Almost surely, 2^22171721705 is an apocalyptic number.

It is an amenable number.

22171721705 is a deficient number, since it is larger than the sum of its proper divisors (8958592279).

22171721705 is a wasteful number, since it uses less digits than its factorization.

22171721705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745.

The product of its (nonzero) digits is 13720, while the sum is 35.

The spelling of 22171721705 in words is "twenty-two billion, one hundred seventy-one million, seven hundred twenty-one thousand, seven hundred five".