12320220221 has 4 divisors (see below), whose sum is σ = 12330007200. Its totient is φ = 12310433244.

The previous prime is 12320220197. The next prime is 12320220223. The reversal of 12320220221 is 12202202321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12202202321 = 43 ⋅283772147.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320220221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12320220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320220223) 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, 4891601 + ... + 4894118.

It is an arithmetic number, because the mean of its divisors is an integer number (3082501800).

Almost surely, 2^12320220221 is an apocalyptic number.

It is an amenable number.

12320220221 is a deficient number, since it is larger than the sum of its proper divisors (9786979).

12320220221 is an equidigital number, since it uses as much as digits as its factorization.

12320220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9786978.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 12320220221 its reverse (12202202321), we get a palindrome (24522422542).

The spelling of 12320220221 in words is "twelve billion, three hundred twenty million, two hundred twenty thousand, two hundred twenty-one".