12321220221 has 12 divisors (see below), whose sum is σ = 18571114848. Its totient is φ = 7857009864.

The previous prime is 12321220201. The next prime is 12321220231. The reversal of 12321220221 is 12202212321.

It is not a de Polignac number, because 12321220221 - 2⁵ = 12321220189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12321220194 and 12321220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321220201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29761195 + ... + 29761608.

It is an arithmetic number, because the mean of its divisors is an integer number (1547592904).

Almost surely, 2^12321220221 is an apocalyptic number.

It is an amenable number.

12321220221 is a deficient number, since it is larger than the sum of its proper divisors (6249894627).

12321220221 is a wasteful number, since it uses less digits than its factorization.

12321220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59522832 (or 59522829 counting only the distinct ones).

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

Adding to 12321220221 its reverse (12202212321), we get a palindrome (24523432542).

The spelling of 12321220221 in words is "twelve billion, three hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".