121100111081 has 2 divisors, whose sum is σ = 121100111082. Its totient is φ = 121100111080.

The previous prime is 121100111053. The next prime is 121100111113. The reversal of 121100111081 is 180111001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98985744400 + 22114366681 = 314620^2 + 148709^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100111081 - 2⁶ = 121100111017 is a prime.

It is a super-3 number, since 3×121100111081³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (121100111981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550055540 + 60550055541.

It is an arithmetic number, because the mean of its divisors is an integer number (60550055541).

Almost surely, 2^121100111081 is an apocalyptic number.

It is an amenable number.

121100111081 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100111081 is an equidigital number, since it uses as much as digits as its factorization.

121100111081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 17.

The spelling of 121100111081 in words is "one hundred twenty-one billion, one hundred million, one hundred eleven thousand, eighty-one".