12312221321 has 16 divisors (see below), whose sum is σ = 13403916288. Its totient is φ = 11263449600.

The previous prime is 12312221297. The next prime is 12312221359.

12312221321 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12312221321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12312221293 and 12312221302.

It is not an unprimeable number, because it can be changed into a prime (12312221221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156296 + ... + 221478.

It is an arithmetic number, because the mean of its divisors is an integer number (837744768).

Almost surely, 2^12312221321 is an apocalyptic number.

It is an amenable number.

12312221321 is a deficient number, since it is larger than the sum of its proper divisors (1091694967).

12312221321 is a wasteful number, since it uses less digits than its factorization.

12312221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65512.

The product of its digits is 288, while the sum is 20.

The spelling of 12312221321 in words is "twelve billion, three hundred twelve million, two hundred twenty-one thousand, three hundred twenty-one".