311212323011213 has 4 divisors (see below), whose sum is σ = 335151732473628. Its totient is φ = 287272913548800.

The previous prime is 311212323011189. The next prime is 311212323011257. The reversal of 311212323011213 is 312110323212113.

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 80169495802564 + 231042827208649 = 8953742^2 + 15200093^2 .

It is a cyclic number.

It is not a de Polignac number, because 311212323011213 - 2¹⁰ = 311212323010189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311212323001213) 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, 11969704731188 + ... + 11969704731213.

It is an arithmetic number, because the mean of its divisors is an integer number (83787933118407).

Almost surely, 2^{311212323011213} is an apocalyptic number.

It is an amenable number.

311212323011213 is a deficient number, since it is larger than the sum of its proper divisors (23939409462415).

311212323011213 is a wasteful number, since it uses less digits than its factorization.

311212323011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23939409462414.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 311212323011213 its reverse (312110323212113), we get a palindrome (623322646223326).

The spelling of 311212323011213 in words is "three hundred eleven trillion, two hundred twelve billion, three hundred twenty-three million, eleven thousand, two hundred thirteen".