22110566221 has 4 divisors (see below), whose sum is σ = 22110870172. Its totient is φ = 22110262272.

The previous prime is 22110566207. The next prime is 22110566249. The reversal of 22110566221 is 12266501122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12266501122 = 2 ⋅6133250561.

It can be written as a sum of positive squares in 2 ways, for example, as 9699492196 + 12411074025 = 98486^2 + 111405^2 .

It is a cyclic number.

It is not a de Polignac number, because 22110566221 - 2⁵ = 22110566189 is a prime.

It is a super-2 number, since 2×22110566221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22110566221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22110566021) 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 3 ways as a sum of consecutive naturals, for example, 28891 + ... + 212263.

It is an arithmetic number, because the mean of its divisors is an integer number (5527717543).

Almost surely, 2^22110566221 is an apocalyptic number.

It is an amenable number.

22110566221 is a deficient number, since it is larger than the sum of its proper divisors (303951).

22110566221 is a wasteful number, since it uses less digits than its factorization.

22110566221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303950.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 22110566221 in words is "twenty-two billion, one hundred ten million, five hundred sixty-six thousand, two hundred twenty-one".