12312311231221 has 8 divisors (see below), whose sum is σ = 12737648412000. Its totient is φ = 11887025698800.

The previous prime is 12312311231177. The next prime is 12312311231239. The reversal of 12312311231221 is 12213211321321.

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 12312311231221 - 2¹³ = 12312311223029 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 (12312311231321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12426771 + ... + 13380928.

It is an arithmetic number, because the mean of its divisors is an integer number (1592206051500).

Almost surely, 2^{12312311231221} is an apocalyptic number.

It is an amenable number.

12312311231221 is a deficient number, since it is larger than the sum of its proper divisors (425337180779).

12312311231221 is a wasteful number, since it uses less digits than its factorization.

12312311231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25824179.

The product of its digits is 864, while the sum is 25.

Adding to 12312311231221 its reverse (12213211321321), we get a palindrome (24525522552542).

The spelling of 12312311231221 in words is "twelve trillion, three hundred twelve billion, three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".