12100111012261 has 2 divisors, whose sum is σ = 12100111012262. Its totient is φ = 12100111012260.

The previous prime is 12100111012219. The next prime is 12100111012313. The reversal of 12100111012261 is 16221011100121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10286324272900 + 1813786739361 = 3207230^2 + 1346769^2 .

It is a cyclic number.

It is not a de Polignac number, because 12100111012261 - 2⁹ = 12100111011749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12100111012961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050055506130 + 6050055506131.

It is an arithmetic number, because the mean of its divisors is an integer number (6050055506131).

Almost surely, 2^{12100111012261} is an apocalyptic number.

It is an amenable number.

12100111012261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12100111012261 is an equidigital number, since it uses as much as digits as its factorization.

12100111012261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 12100111012261 its reverse (16221011100121), we get a palindrome (28321122112382).

The spelling of 12100111012261 in words is "twelve trillion, one hundred billion, one hundred eleven million, twelve thousand, two hundred sixty-one".