12211212130261 has 2 divisors, whose sum is σ = 12211212130262. Its totient is φ = 12211212130260.

The previous prime is 12211212130199. The next prime is 12211212130297. The reversal of 12211212130261 is 16203121211221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10589394598225 + 1621817532036 = 3254135^2 + 1273506^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211212130261 - 2⁷ = 12211212130133 is a prime.

It is a super-2 number, since 2×12211212130261² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211212137261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105606065130 + 6105606065131.

It is an arithmetic number, because the mean of its divisors is an integer number (6105606065131).

Almost surely, 2^{12211212130261} is an apocalyptic number.

It is an amenable number.

12211212130261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211212130261 is an equidigital number, since it uses as much as digits as its factorization.

12211212130261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 12211212130261 its reverse (16203121211221), we get a palindrome (28414333341482).

The spelling of 12211212130261 in words is "twelve trillion, two hundred eleven billion, two hundred twelve million, one hundred thirty thousand, two hundred sixty-one".