12122551121 has 2 divisors, whose sum is σ = 12122551122. Its totient is φ = 12122551120.

The previous prime is 12122551079. The next prime is 12122551123. The reversal of 12122551121 is 12115522121.

12122551121 is nontrivially palindromic in base 5.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11997916225 + 124634896 = 109535^2 + 11164^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122551121 - 2¹⁸ = 12122288977 is a prime.

Together with 12122551123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12122551123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061275560 + 6061275561.

It is an arithmetic number, because the mean of its divisors is an integer number (6061275561).

Almost surely, 2^12122551121 is an apocalyptic number.

It is an amenable number.

12122551121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122551121 is an equidigital number, since it uses as much as digits as its factorization.

12122551121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 23.

The spelling of 12122551121 in words is "twelve billion, one hundred twenty-two million, five hundred fifty-one thousand, one hundred twenty-one".