12031322231 has 2 divisors, whose sum is σ = 12031322232.
Its totient is φ = 12031322230.
The previous prime is 12031322167. The next prime is 12031322309. The reversal of 12031322231 is 13222313021.
It is a weak prime.
It is an emirp because it is prime and its reverse (13222313021) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 12031322231 - 26 = 12031322167 is a prime.
It is a super-2 number, since 2×120313222312 (a number of 21 digits) contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12031322431) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6015661115 + 6015661116.
It is an arithmetic number, because the mean of its divisors is an integer number (6015661116).
Almost surely, 212031322231 is an apocalyptic number.
12031322231 is a deficient number, since it is larger than the sum of its proper divisors (1).
12031322231 is an equidigital number, since it uses as much as digits as its factorization.
12031322231 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 432, while the sum is 20.
Adding to 12031322231 its reverse (13222313021), we get a palindrome (25253635252).
The spelling of 12031322231 in words is "twelve billion, thirty-one million, three hundred twenty-two thousand, two hundred thirty-one".