12122110121 has 4 divisors (see below), whose sum is σ = 13224120144. Its totient is φ = 11020100100.

The previous prime is 12122110069. The next prime is 12122110123. The reversal of 12122110121 is 12101122121.

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-12122110121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12122110096 and 12122110105.

It is not an unprimeable number, because it can be changed into a prime (12122110123) 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, 551004995 + ... + 551005016.

It is an arithmetic number, because the mean of its divisors is an integer number (3306030036).

Almost surely, 2^12122110121 is an apocalyptic number.

12122110121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12122110121 is a deficient number, since it is larger than the sum of its proper divisors (1102010023).

12122110121 is a wasteful number, since it uses less digits than its factorization.

12122110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102010022.

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

Adding to 12122110121 its reverse (12101122121), we get a palindrome (24223232242).

The spelling of 12122110121 in words is "twelve billion, one hundred twenty-two million, one hundred ten thousand, one hundred twenty-one".