12201220221 has 4 divisors (see below), whose sum is σ = 16268293632. Its totient is φ = 8134146812.

The previous prime is 12201220181. The next prime is 12201220231. The reversal of 12201220221 is 12202210221.

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: 12202210221 = 3 ⋅4067403407.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12201220221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12201220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201220231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033536701 + ... + 2033536706.

It is an arithmetic number, because the mean of its divisors is an integer number (4067073408).

Almost surely, 2^12201220221 is an apocalyptic number.

It is an amenable number.

12201220221 is a deficient number, since it is larger than the sum of its proper divisors (4067073411).

12201220221 is an equidigital number, since it uses as much as digits as its factorization.

12201220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067073410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12201220221 its reverse (12202210221), we get a palindrome (24403430442).

The spelling of 12201220221 in words is "twelve billion, two hundred one million, two hundred twenty thousand, two hundred twenty-one".