1211111110213 has 2 divisors, whose sum is σ = 1211111110214. Its totient is φ = 1211111110212.

The previous prime is 1211111110189. The next prime is 1211111110283. The reversal of 1211111110213 is 3120111111121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1195790364484 + 15320745729 = 1093522^2 + 123777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211111110213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211111110283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605555555106 + 605555555107.

It is an arithmetic number, because the mean of its divisors is an integer number (605555555107).

Almost surely, 2^{1211111110213} is an apocalyptic number.

It is an amenable number.

1211111110213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211111110213 is an equidigital number, since it uses as much as digits as its factorization.

1211111110213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 1211111110213 its reverse (3120111111121), we get a palindrome (4331222221334).

The spelling of 1211111110213 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred ten thousand, two hundred thirteen".