12122121121 has 8 divisors (see below), whose sum is σ = 13286808288. Its totient is φ = 10967880000.

The previous prime is 12122121103. The next prime is 12122121149. The reversal of 12122121121 is 12112122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12122121121 - 2¹⁵ = 12122088353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122121095 and 12122121104.

It is not an unprimeable number, because it can be changed into a prime (12122121421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2609080 + ... + 2613721.

It is an arithmetic number, because the mean of its divisors is an integer number (1660851036).

Almost surely, 2^12122121121 is an apocalyptic number.

12122121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12122121121 is a deficient number, since it is larger than the sum of its proper divisors (1164687167).

12122121121 is a wasteful number, since it uses less digits than its factorization.

12122121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5223023.

The product of its digits is 32, while the sum is 16.

Adding to 12122121121 its reverse (12112122121), we get a palindrome (24234243242).

It can be divided in two parts, 12122121 and 121, that multiplied together give a palindrome (1466776641).

The spelling of 12122121121 in words is "twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".