121112110121 has 4 divisors (see below), whose sum is σ = 121115086932. Its totient is φ = 121109133312.

The previous prime is 121112110081. The next prime is 121112110127. The reversal of 121112110121 is 121011211121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121011211121 = 286289 ⋅422689.

It can be written as a sum of positive squares in 2 ways, for example, as 82247930521 + 38864179600 = 286789^2 + 197140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121112110121 is a prime.

It is a super-2 number, since 2×121112110121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112110096 and 121112110105.

It is not an unprimeable number, because it can be changed into a prime (121112110127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426520 + ... + 1509033.

It is an arithmetic number, because the mean of its divisors is an integer number (30278771733).

Almost surely, 2^121112110121 is an apocalyptic number.

It is an amenable number.

121112110121 is a deficient number, since it is larger than the sum of its proper divisors (2976811).

121112110121 is an equidigital number, since it uses as much as digits as its factorization.

121112110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976810.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121112110121 its reverse (121011211121), we get a palindrome (242123321242).

The spelling of 121112110121 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred ten thousand, one hundred twenty-one".