111011211211213 has 2 divisors, whose sum is σ = 111011211211214. Its totient is φ = 111011211211212.

The previous prime is 111011211211139. The next prime is 111011211211231. The reversal of 111011211211213 is 312112112110111.

It is a happy number.

Together with next prime (111011211211231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97239853494729 + 13771357716484 = 9861027^2 + 3710978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111011211211213 is a prime.

It is a super-4 number, since 4×111011211211213⁴ (a number of 57 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111011211211253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505605605606 + 55505605605607.

It is an arithmetic number, because the mean of its divisors is an integer number (55505605605607).

Almost surely, 2^{111011211211213} is an apocalyptic number.

It is an amenable number.

111011211211213 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011211211213 is an equidigital number, since it uses as much as digits as its factorization.

111011211211213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 19.

Adding to 111011211211213 its reverse (312112112110111), we get a palindrome (423123323321324).

The spelling of 111011211211213 in words is "one hundred eleven trillion, eleven billion, two hundred eleven million, two hundred eleven thousand, two hundred thirteen".