111211212031 has 2 divisors, whose sum is σ = 111211212032. Its totient is φ = 111211212030.

The previous prime is 111211211963. The next prime is 111211212061. The reversal of 111211212031 is 130212112111.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (130212112111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111211212031 - 2¹³ = 111211203839 is a prime.

It is a super-2 number, since 2×111211212031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111211211996 and 111211212014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211212061) 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, 55605606015 + 55605606016.

It is an arithmetic number, because the mean of its divisors is an integer number (55605606016).

Almost surely, 2^111211212031 is an apocalyptic number.

111211212031 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211212031 is an equidigital number, since it uses as much as digits as its factorization.

111211212031 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 111211212031 its reverse (130212112111), we get a palindrome (241423324142).

The spelling of 111211212031 in words is "one hundred eleven billion, two hundred eleven million, two hundred twelve thousand, thirty-one".