12111221131 has 2 divisors, whose sum is σ = 12111221132. Its totient is φ = 12111221130.

The previous prime is 12111221099. The next prime is 12111221153. The reversal of 12111221131 is 13112211121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13112211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12111221131 - 2⁵ = 12111221099 is a prime.

It is a super-2 number, since 2×12111221131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12111221191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055610565 + 6055610566.

It is an arithmetic number, because the mean of its divisors is an integer number (6055610566).

Almost surely, 2^12111221131 is an apocalyptic number.

12111221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111221131 is an equidigital number, since it uses as much as digits as its factorization.

12111221131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 16.

Adding to 12111221131 its reverse (13112211121), we get a palindrome (25223432252).

The spelling of 12111221131 in words is "twelve billion, one hundred eleven million, two hundred twenty-one thousand, one hundred thirty-one".