12105224161 has 4 divisors (see below), whose sum is σ = 12123538324. Its totient is φ = 12086910000.

The previous prime is 12105224137. The next prime is 12105224171. The reversal of 12105224161 is 16142250121.

12105224161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16142250121 = 53 ⋅304570757.

It can be written as a sum of positive squares in 2 ways, for example, as 10659323536 + 1445900625 = 103244^2 + 38025^2 .

It is a cyclic number.

It is not a de Polignac number, because 12105224161 - 2²⁹ = 11568353249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12105224171) 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, 9156090 + ... + 9157411.

It is an arithmetic number, because the mean of its divisors is an integer number (3030884581).

Almost surely, 2^12105224161 is an apocalyptic number.

It is an amenable number.

12105224161 is a deficient number, since it is larger than the sum of its proper divisors (18314163).

12105224161 is an equidigital number, since it uses as much as digits as its factorization.

12105224161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18314162.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 12105224161 its reverse (16142250121), we get a palindrome (28247474282).

The spelling of 12105224161 in words is "twelve billion, one hundred five million, two hundred twenty-four thousand, one hundred sixty-one".