12111212213 has 2 divisors, whose sum is σ = 12111212214. Its totient is φ = 12111212212.

The previous prime is 12111212209. The next prime is 12111212221. The reversal of 12111212213 is 31221211121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11995068484 + 116143729 = 109522^2 + 10777^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111212213 - 2² = 12111212209 is a prime.

It is a super-2 number, since 2×12111212213² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12111212191 and 12111212200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111212513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055606106 + 6055606107.

It is an arithmetic number, because the mean of its divisors is an integer number (6055606107).

Almost surely, 2^12111212213 is an apocalyptic number.

It is an amenable number.

12111212213 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111212213 is an equidigital number, since it uses as much as digits as its factorization.

12111212213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

Adding to 12111212213 its reverse (31221211121), we get a palindrome (43332423334).

The spelling of 12111212213 in words is "twelve billion, one hundred eleven million, two hundred twelve thousand, two hundred thirteen".