12121120261 has 2 divisors, whose sum is σ = 12121120262. Its totient is φ = 12121120260.

The previous prime is 12121120247. The next prime is 12121120327. The reversal of 12121120261 is 16202112121.

12121120261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8465104036 + 3656016225 = 92006^2 + 60465^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121120261 - 2²⁵ = 12087565829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121520261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060560130 + 6060560131.

It is an arithmetic number, because the mean of its divisors is an integer number (6060560131).

Almost surely, 2^12121120261 is an apocalyptic number.

It is an amenable number.

12121120261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121120261 is an equidigital number, since it uses as much as digits as its factorization.

12121120261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 12121120261 its reverse (16202112121), we get a palindrome (28323232382).

The spelling of 12121120261 in words is "twelve billion, one hundred twenty-one million, one hundred twenty thousand, two hundred sixty-one".