11122120981 has 2 divisors, whose sum is σ = 11122120982. Its totient is φ = 11122120980.

The previous prime is 11122120927. The next prime is 11122121047. The reversal of 11122120981 is 18902122111.

11122120981 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., 7350318756 + 3771802225 = 85734^2 + 61415^2 .

It is a cyclic number.

It is not a de Polignac number, because 11122120981 - 2⁷ = 11122120853 is a prime.

It is a super-2 number, since 2×11122120981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11122120921) 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, 5561060490 + 5561060491.

It is an arithmetic number, because the mean of its divisors is an integer number (5561060491).

Almost surely, 2^11122120981 is an apocalyptic number.

It is an amenable number.

11122120981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11122120981 is an equidigital number, since it uses as much as digits as its factorization.

11122120981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 11122120981 in words is "eleven billion, one hundred twenty-two million, one hundred twenty thousand, nine hundred eighty-one".