12011020121 has 2 divisors, whose sum is σ = 12011020122. Its totient is φ = 12011020120.

The previous prime is 12011020117. The next prime is 12011020139. The reversal of 12011020121 is 12102011021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11403890521 + 607129600 = 106789^2 + 24640^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011020121 - 2² = 12011020117 is a prime.

It is not a weakly prime, because it can be changed into another prime (12011020111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005510060 + 6005510061.

It is an arithmetic number, because the mean of its divisors is an integer number (6005510061).

Almost surely, 2^12011020121 is an apocalyptic number.

It is an amenable number.

12011020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011020121 is an equidigital number, since it uses as much as digits as its factorization.

12011020121 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 11.

Adding to 12011020121 its reverse (12102011021), we get a palindrome (24113031142).

The spelling of 12011020121 in words is "twelve billion, eleven million, twenty thousand, one hundred twenty-one".