12105423247 has 2 divisors, whose sum is σ = 12105423248. Its totient is φ = 12105423246.

The previous prime is 12105423193. The next prime is 12105423263. The reversal of 12105423247 is 74232450121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12105423247 - 2¹⁹ = 12104898959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12105423047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6052711623 + 6052711624.

It is an arithmetic number, because the mean of its divisors is an integer number (6052711624).

Almost surely, 2^12105423247 is an apocalyptic number.

12105423247 is a deficient number, since it is larger than the sum of its proper divisors (1).

12105423247 is an equidigital number, since it uses as much as digits as its factorization.

12105423247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 12105423247 its reverse (74232450121), we get a palindrome (86337873368).

The spelling of 12105423247 in words is "twelve billion, one hundred five million, four hundred twenty-three thousand, two hundred forty-seven".