11321212213 has 4 divisors (see below), whose sum is σ = 11321632588. Its totient is φ = 11320791840.

The previous prime is 11321212211. The next prime is 11321212267. The reversal of 11321212213 is 31221212311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6205815729 + 5115396484 = 78777^2 + 71522^2 .

It is a cyclic number.

It is not a de Polignac number, because 11321212213 - 2¹ = 11321212211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321212211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166806 + ... + 224647.

It is an arithmetic number, because the mean of its divisors is an integer number (2830408147).

Almost surely, 2^11321212213 is an apocalyptic number.

It is an amenable number.

11321212213 is a deficient number, since it is larger than the sum of its proper divisors (420375).

11321212213 is an equidigital number, since it uses as much as digits as its factorization.

11321212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420374.

The product of its digits is 144, while the sum is 19.

Adding to 11321212213 its reverse (31221212311), we get a palindrome (42542424524).

The spelling of 11321212213 in words is "eleven billion, three hundred twenty-one million, two hundred twelve thousand, two hundred thirteen".