12213131213 has 8 divisors (see below), whose sum is σ = 12268787256. Its totient is φ = 12157516800.

The previous prime is 12213131171. The next prime is 12213131263. The reversal of 12213131213 is 31213131221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6516202729 + 5696928484 = 80723^2 + 75478^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12213131213 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 (12213131263) 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 in 7 ways as a sum of consecutive naturals, for example, 680645 + ... + 698357.

It is an arithmetic number, because the mean of its divisors is an integer number (1533598407).

Almost surely, 2^12213131213 is an apocalyptic number.

It is an amenable number.

12213131213 is a deficient number, since it is larger than the sum of its proper divisors (55656043).

12213131213 is a wasteful number, since it uses less digits than its factorization.

12213131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20815.

The product of its digits is 216, while the sum is 20.

Adding to 12213131213 its reverse (31213131221), we get a palindrome (43426262434).

The spelling of 12213131213 in words is "twelve billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred thirteen".