12155411321 has 2 divisors, whose sum is σ = 12155411322. Its totient is φ = 12155411320.

The previous prime is 12155411311. The next prime is 12155411353. The reversal of 12155411321 is 12311455121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10886626921 + 1268784400 = 104339^2 + 35620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12155411321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12155411311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077705660 + 6077705661.

It is an arithmetic number, because the mean of its divisors is an integer number (6077705661).

Almost surely, 2^12155411321 is an apocalyptic number.

It is an amenable number.

12155411321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155411321 is an equidigital number, since it uses as much as digits as its factorization.

12155411321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 26.

Adding to 12155411321 its reverse (12311455121), we get a palindrome (24466866442).

The spelling of 12155411321 in words is "twelve billion, one hundred fifty-five million, four hundred eleven thousand, three hundred twenty-one".