12211211231 has 4 divisors (see below), whose sum is σ = 12929517792. Its totient is φ = 11492904672.

The previous prime is 12211211219. The next prime is 12211211263. The reversal of 12211211231 is 13211211221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13211211221 = 13 ⋅1016247017.

It is not a de Polignac number, because 12211211231 - 2⁶ = 12211211167 is a prime.

It is a super-2 number, since 2×12211211231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 718306543 = 12211211231 / (1 + 2 + 2 + 1 + 1 + 2 + 1 + 1 + 2 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211211531) 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, 359153255 + ... + 359153288.

It is an arithmetic number, because the mean of its divisors is an integer number (3232379448).

Almost surely, 2^12211211231 is an apocalyptic number.

12211211231 is a deficient number, since it is larger than the sum of its proper divisors (718306561).

12211211231 is an equidigital number, since it uses as much as digits as its factorization.

12211211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718306560.

The product of its digits is 48, while the sum is 17.

Adding to 12211211231 its reverse (13211211221), we get a palindrome (25422422452).

The spelling of 12211211231 in words is "twelve billion, two hundred eleven million, two hundred eleven thousand, two hundred thirty-one".