12321212257 has 2 divisors, whose sum is σ = 12321212258. Its totient is φ = 12321212256.

The previous prime is 12321212231. The next prime is 12321212287. The reversal of 12321212257 is 75221212321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6629867776 + 5691344481 = 81424^2 + 75441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12321212257 is a prime.

It is not a weakly prime, because it can be changed into another prime (12321212287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160606128 + 6160606129.

It is an arithmetic number, because the mean of its divisors is an integer number (6160606129).

Almost surely, 2^12321212257 is an apocalyptic number.

It is an amenable number.

12321212257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12321212257 is an equidigital number, since it uses as much as digits as its factorization.

12321212257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

Adding to 12321212257 its reverse (75221212321), we get a palindrome (87542424578).

The spelling of 12321212257 in words is "twelve billion, three hundred twenty-one million, two hundred twelve thousand, two hundred fifty-seven".