12121121 has 2 divisors, whose sum is σ = 12121122. Its totient is φ = 12121120.

The previous prime is 12121103. The next prime is 12121133. The reversal of 12121121 is 12112121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 1784896 = 3215^2 + 1336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12121321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060560 + 6060561.

It is an arithmetic number, because the mean of its divisors is an integer number (6060561).

Almost surely, 2^12121121 is an apocalyptic number.

It is an amenable number.

12121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121121 is an equidigital number, since it uses as much as digits as its factorization.

12121121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8, while the sum is 11.

The square root of 12121121 is about 3481.5400328016. The cubic root of 12121121 is about 229.7105432417.

Adding to 12121121 its reverse (12112121), we get a palindrome (24233242).

It can be divided in two parts, 12121 and 121, that multiplied together give a palindrome (1466641).

The spelling of 12121121 in words is "twelve million, one hundred twenty-one thousand, one hundred twenty-one".