11311122213 has 48 divisors (see below), whose sum is σ = 17219545200. Its totient is φ = 7144381440.

The previous prime is 11311122191. The next prime is 11311122239. The reversal of 11311122213 is 31222111311.

It can be written as a sum of positive squares in 8 ways, for example, as 161604 + 11310960609 = 402^2 + 106353^2 .

It is not a de Polignac number, because 11311122213 - 2⁸ = 11311121957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311122013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13198081 + ... + 13198937.

It is an arithmetic number, because the mean of its divisors is an integer number (358740525).

Almost surely, 2^11311122213 is an apocalyptic number.

It is an amenable number.

11311122213 is a deficient number, since it is larger than the sum of its proper divisors (5908422987).

11311122213 is a wasteful number, since it uses less digits than its factorization.

11311122213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1779 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11311122213 its reverse (31222111311), we get a palindrome (42533233524).

The spelling of 11311122213 in words is "eleven billion, three hundred eleven million, one hundred twenty-two thousand, two hundred thirteen".