12111022121 has 4 divisors (see below), whose sum is σ = 13212024144. Its totient is φ = 11010020100.

The previous prime is 12111022069. The next prime is 12111022127. The reversal of 12111022121 is 12122011121.

12111022121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111022121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111022096 and 12111022105.

It is not an unprimeable number, because it can be changed into a prime (12111022127) 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 in 3 ways as a sum of consecutive naturals, for example, 550500995 + ... + 550501016.

It is an arithmetic number, because the mean of its divisors is an integer number (3303006036).

Almost surely, 2^12111022121 is an apocalyptic number.

12111022121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111022121 is a deficient number, since it is larger than the sum of its proper divisors (1101002023).

12111022121 is a wasteful number, since it uses less digits than its factorization.

12111022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101002022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12111022121 its reverse (12122011121), we get a palindrome (24233033242).

The spelling of 12111022121 in words is "twelve billion, one hundred eleven million, twenty-two thousand, one hundred twenty-one".