12311213021 has 4 divisors (see below), whose sum is σ = 12312115200. Its totient is φ = 12310310844.

The previous prime is 12311213011. The next prime is 12311213027. The reversal of 12311213021 is 12031211321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12311213021 - 2⁶ = 12311212957 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 (12311213027) 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, 430301 + ... + 458018.

It is an arithmetic number, because the mean of its divisors is an integer number (3078028800).

Almost surely, 2^12311213021 is an apocalyptic number.

It is an amenable number.

12311213021 is a deficient number, since it is larger than the sum of its proper divisors (902179).

12311213021 is an equidigital number, since it uses as much as digits as its factorization.

12311213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902178.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12311213021 its reverse (12031211321), we get a palindrome (24342424342).

The spelling of 12311213021 in words is "twelve billion, three hundred eleven million, two hundred thirteen thousand, twenty-one".