12312321131221 has 4 divisors (see below), whose sum is σ = 12312812921292. Its totient is φ = 12311829341152.

The previous prime is 12312321131197. The next prime is 12312321131233. The reversal of 12312321131221 is 12213112321321.

12312321131221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6793998640900 + 5518322490321 = 2606530^2 + 2349111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312321131221 - 2⁷ = 12312321131093 is a prime.

It is a super-2 number, since 2×12312321131221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312321131261) 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, 245857480 + ... + 245907553.

It is an arithmetic number, because the mean of its divisors is an integer number (3078203230323).

Almost surely, 2^{12312321131221} is an apocalyptic number.

It is an amenable number.

12312321131221 is a deficient number, since it is larger than the sum of its proper divisors (491790071).

12312321131221 is an equidigital number, since it uses as much as digits as its factorization.

12312321131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491790070.

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

Adding to 12312321131221 its reverse (12213112321321), we get a palindrome (24525433452542).

The spelling of 12312321131221 in words is "twelve trillion, three hundred twelve billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".