12111031121 has 4 divisors (see below), whose sum is σ = 13841178432. Its totient is φ = 10380883812.

The previous prime is 12111031063. The next prime is 12111031139. The reversal of 12111031121 is 12113011121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12113011121 = 60133 ⋅201437.

It is a cyclic number.

It is not a de Polignac number, because 12111031121 - 2⁶ = 12111031057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111031096 and 12111031105.

It is not an unprimeable number, because it can be changed into a prime (12111031151) 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, 865073645 + ... + 865073658.

It is an arithmetic number, because the mean of its divisors is an integer number (3460294608).

Almost surely, 2^12111031121 is an apocalyptic number.

It is an amenable number.

12111031121 is a deficient number, since it is larger than the sum of its proper divisors (1730147311).

12111031121 is an equidigital number, since it uses as much as digits as its factorization.

12111031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730147310.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 12111031121 its reverse (12113011121), we get a palindrome (24224042242).

The spelling of 12111031121 in words is "twelve billion, one hundred eleven million, thirty-one thousand, one hundred twenty-one".