12121122121 has 2 divisors, whose sum is σ = 12121122122. Its totient is φ = 12121122120.

The previous prime is 12121122119. The next prime is 12121122127. The reversal of 12121122121 is 12122112121.

12121122121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7361640000 + 4759482121 = 85800^2 + 68989^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121122121 - 2¹ = 12121122119 is a prime.

Together with 12121122119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12121122095 and 12121122104.

It is not a weakly prime, because it can be changed into another prime (12121122127) 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 as a sum of consecutive naturals, namely, 6060561060 + 6060561061.

It is an arithmetic number, because the mean of its divisors is an integer number (6060561061).

Almost surely, 2^12121122121 is an apocalyptic number.

It is an amenable number.

12121122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121122121 is an equidigital number, since it uses as much as digits as its factorization.

12121122121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12121122121 its reverse (12122112121), we get a palindrome (24243234242).

The spelling of 12121122121 in words is "twelve billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".