1211124211181 has 2 divisors, whose sum is σ = 1211124211182. Its totient is φ = 1211124211180.

The previous prime is 1211124211163. The next prime is 1211124211201. The reversal of 1211124211181 is 1811124211121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1160125022281 + 50999188900 = 1077091^2 + 225830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211124211181 - 2⁶ = 1211124211117 is a prime.

It is a super-2 number, since 2×1211124211181² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211124211181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211124111181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605562105590 + 605562105591.

It is an arithmetic number, because the mean of its divisors is an integer number (605562105591).

Almost surely, 2^{1211124211181} is an apocalyptic number.

It is an amenable number.

1211124211181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211124211181 is an equidigital number, since it uses as much as digits as its factorization.

1211124211181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 26.

The spelling of 1211124211181 in words is "one trillion, two hundred eleven billion, one hundred twenty-four million, two hundred eleven thousand, one hundred eighty-one".