12020020211261 has 2 divisors, whose sum is σ = 12020020211262. Its totient is φ = 12020020211260.

The previous prime is 12020020211239. The next prime is 12020020211299. The reversal of 12020020211261 is 16211202002021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8032434564025 + 3987585647236 = 2834155^2 + 1996894^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020020211261 - 2⁶ = 12020020211197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12020020211231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010010105630 + 6010010105631.

It is an arithmetic number, because the mean of its divisors is an integer number (6010010105631).

Almost surely, 2^{12020020211261} is an apocalyptic number.

It is an amenable number.

12020020211261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020020211261 is an equidigital number, since it uses as much as digits as its factorization.

12020020211261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 12020020211261 its reverse (16211202002021), we get a palindrome (28231222213282).

The spelling of 12020020211261 in words is "twelve trillion, twenty billion, twenty million, two hundred eleven thousand, two hundred sixty-one".