1211020211113 has 2 divisors, whose sum is σ = 1211020211114. Its totient is φ = 1211020211112.

The previous prime is 1211020211087. The next prime is 1211020211123. The reversal of 1211020211113 is 3111120201121.

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., 1210886762409 + 133448704 = 1100403^2 + 11552^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211020211113 - 2⁵ = 1211020211081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211020211123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510105556 + 605510105557.

It is an arithmetic number, because the mean of its divisors is an integer number (605510105557).

Almost surely, 2^{1211020211113} is an apocalyptic number.

It is an amenable number.

1211020211113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211020211113 is an equidigital number, since it uses as much as digits as its factorization.

1211020211113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1211020211113 its reverse (3111120201121), we get a palindrome (4322140412234).

The spelling of 1211020211113 in words is "one trillion, two hundred eleven billion, twenty million, two hundred eleven thousand, one hundred thirteen".