12312021113213 has 4 divisors (see below), whose sum is σ = 12312202932348. Its totient is φ = 12311839294080.

The previous prime is 12312021113153. The next prime is 12312021113219. The reversal of 12312021113213 is 31231112021321.

It is a happy number.

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 2442037540804 + 9869983572409 = 1562702^2 + 3141653^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312021113213 - 2³⁰ = 12310947371389 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 (12312021113219) 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, 90807956 + ... + 90943437.

It is an arithmetic number, because the mean of its divisors is an integer number (3078050733087).

Almost surely, 2^{12312021113213} is an apocalyptic number.

It is an amenable number.

12312021113213 is a deficient number, since it is larger than the sum of its proper divisors (181819135).

12312021113213 is an equidigital number, since it uses as much as digits as its factorization.

12312021113213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181819134.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 12312021113213 its reverse (31231112021321), we get a palindrome (43543133134534).

The spelling of 12312021113213 in words is "twelve trillion, three hundred twelve billion, twenty-one million, one hundred thirteen thousand, two hundred thirteen".