22171216549 has 4 divisors (see below), whose sum is σ = 22171525740. Its totient is φ = 22170907360.

The previous prime is 22171216547. The next prime is 22171216559. The reversal of 22171216549 is 94561217122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14511816225 + 7659400324 = 120465^2 + 87518^2 .

It is a cyclic number.

It is not a de Polignac number, because 22171216549 - 2¹ = 22171216547 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22171216547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14937 + ... + 211105.

It is an arithmetic number, because the mean of its divisors is an integer number (5542881435).

Almost surely, 2^22171216549 is an apocalyptic number.

It is an amenable number.

22171216549 is a deficient number, since it is larger than the sum of its proper divisors (309191).

22171216549 is a wasteful number, since it uses less digits than its factorization.

22171216549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309190.

The product of its digits is 60480, while the sum is 40.

The spelling of 22171216549 in words is "twenty-two billion, one hundred seventy-one million, two hundred sixteen thousand, five hundred forty-nine".