12121011121 has 2 divisors, whose sum is σ = 12121011122. Its totient is φ = 12121011120.

The previous prime is 12121011083. The next prime is 12121011137. The reversal of 12121011121 is 12111012121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6389764096 + 5731247025 = 79936^2 + 75705^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121011121 - 2⁹ = 12121010609 is a prime.

It is not a weakly prime, because it can be changed into another prime (12121011521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060505560 + 6060505561.

It is an arithmetic number, because the mean of its divisors is an integer number (6060505561).

Almost surely, 2^12121011121 is an apocalyptic number.

It is an amenable number.

12121011121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121011121 is an equidigital number, since it uses as much as digits as its factorization.

12121011121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12121011121 its reverse (12111012121), we get a palindrome (24232023242).

The spelling of 12121011121 in words is "twelve billion, one hundred twenty-one million, eleven thousand, one hundred twenty-one".