12644222231 has 2 divisors, whose sum is σ = 12644222232. Its totient is φ = 12644222230.

The previous prime is 12644222189. The next prime is 12644222233. The reversal of 12644222231 is 13222244621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12644222231 - 2⁶ = 12644222167 is a prime.

It is a super-2 number, since 2×12644222231² (a number of 21 digits) contains 22 as substring.

Together with 12644222233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12644222194 and 12644222203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12644222233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322111115 + 6322111116.

It is an arithmetic number, because the mean of its divisors is an integer number (6322111116).

Almost surely, 2^12644222231 is an apocalyptic number.

12644222231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644222231 is an equidigital number, since it uses as much as digits as its factorization.

12644222231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 29.

Adding to 12644222231 its reverse (13222244621), we get a palindrome (25866466852).

The spelling of 12644222231 in words is "twelve billion, six hundred forty-four million, two hundred twenty-two thousand, two hundred thirty-one".