12320221221 has 48 divisors (see below), whose sum is σ = 22902816768. Its totient is φ = 6193648800.

The previous prime is 12320221213. The next prime is 12320221237. The reversal of 12320221221 is 12212202321.

It is not a de Polignac number, because 12320221221 - 2³ = 12320221213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12320221194 and 12320221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320221201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265261 + ... + 308226.

It is an arithmetic number, because the mean of its divisors is an integer number (477142016).

Almost surely, 2^12320221221 is an apocalyptic number.

12320221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12320221221 is a deficient number, since it is larger than the sum of its proper divisors (10582595547).

12320221221 is a wasteful number, since it uses less digits than its factorization.

12320221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573542 (or 573539 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12320221221 its reverse (12212202321), we get a palindrome (24532423542).

The spelling of 12320221221 in words is "twelve billion, three hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".