12312440213 has 4 divisors (see below), whose sum is σ = 13036701420. Its totient is φ = 11588179008.

The previous prime is 12312440197. The next prime is 12312440219. The reversal of 12312440213 is 31204421321.

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 6281830564 + 6030609649 = 79258^2 + 77657^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312440213 - 2⁴ = 12312440197 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 (12312440219) 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, 362130578 + ... + 362130611.

It is an arithmetic number, because the mean of its divisors is an integer number (3259175355).

Almost surely, 2^12312440213 is an apocalyptic number.

It is an amenable number.

12312440213 is a deficient number, since it is larger than the sum of its proper divisors (724261207).

12312440213 is an equidigital number, since it uses as much as digits as its factorization.

12312440213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724261206.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 12312440213 its reverse (31204421321), we get a palindrome (43516861534).

The spelling of 12312440213 in words is "twelve billion, three hundred twelve million, four hundred forty thousand, two hundred thirteen".