11121102209981 has 2 divisors, whose sum is σ = 11121102209982. Its totient is φ = 11121102209980.

The previous prime is 11121102209947. The next prime is 11121102210041. The reversal of 11121102209981 is 18990220112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11040933384100 + 80168825881 = 3322790^2 + 283141^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121102209981 - 2²⁶ = 11121035101117 is a prime.

It is a super-2 number, since 2×11121102209981² (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 (11121102209381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560551104990 + 5560551104991.

It is an arithmetic number, because the mean of its divisors is an integer number (5560551104991).

Almost surely, 2^{11121102209981} is an apocalyptic number.

It is an amenable number.

11121102209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121102209981 is an equidigital number, since it uses as much as digits as its factorization.

11121102209981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 38.

The spelling of 11121102209981 in words is "eleven trillion, one hundred twenty-one billion, one hundred two million, two hundred nine thousand, nine hundred eighty-one".