1211211113113 has 2 divisors, whose sum is σ = 1211211113114. Its totient is φ = 1211211113112.

The previous prime is 1211211113081. The next prime is 1211211113117. The reversal of 1211211113113 is 3113111121121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210908770569 + 302342544 = 1100413^2 + 17388^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211211113113 - 2⁵ = 1211211113081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211211113117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605605556556 + 605605556557.

It is an arithmetic number, because the mean of its divisors is an integer number (605605556557).

Almost surely, 2^{1211211113113} is an apocalyptic number.

It is an amenable number.

1211211113113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211211113113 is an equidigital number, since it uses as much as digits as its factorization.

1211211113113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 19.

Adding to 1211211113113 its reverse (3113111121121), we get a palindrome (4324322234234).

The spelling of 1211211113113 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred thirteen thousand, one hundred thirteen".