13231210121 has 2 divisors, whose sum is σ = 13231210122. Its totient is φ = 13231210120.

The previous prime is 13231210051. The next prime is 13231210129. The reversal of 13231210121 is 12101213231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12981412096 + 249798025 = 113936^2 + 15805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13231210121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13231210121.

It is not a weakly prime, because it can be changed into another prime (13231210129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615605060 + 6615605061.

It is an arithmetic number, because the mean of its divisors is an integer number (6615605061).

Almost surely, 2^13231210121 is an apocalyptic number.

It is an amenable number.

13231210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231210121 is an equidigital number, since it uses as much as digits as its factorization.

13231210121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 13231210121 its reverse (12101213231), we get a palindrome (25332423352).

The spelling of 13231210121 in words is "thirteen billion, two hundred thirty-one million, two hundred ten thousand, one hundred twenty-one".