12131213 has 8 divisors (see below), whose sum is σ = 12397368. Its totient is φ = 11867904.

The previous prime is 12131179. The next prime is 12131219. The reversal of 12131213 is 31213121.

It can be written as a sum of positive squares in 4 ways, for example, as 386884 + 11744329 = 622^2 + 3427^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12131213 - 2¹⁸ = 11869069 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 (12131219) 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 7 ways as a sum of consecutive naturals, for example, 9395 + ... + 10607.

It is an arithmetic number, because the mean of its divisors is an integer number (1549671).

Almost surely, 2^12131213 is an apocalyptic number.

It is an amenable number.

12131213 is a deficient number, since it is larger than the sum of its proper divisors (266155).

12131213 is a wasteful number, since it uses less digits than its factorization.

12131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423.

The product of its digits is 36, while the sum is 14.

The square root of 12131213 is about 3482.9890898480. The cubic root of 12131213 is about 229.7742776029.

Adding to 12131213 its reverse (31213121), we get a palindrome (43344334).

It can be divided in two parts, 1213121 and 3, that multiplied together give a palindrome (3639363).

The spelling of 12131213 in words is "twelve million, one hundred thirty-one thousand, two hundred thirteen".