12220211221 has 4 divisors (see below), whose sum is σ = 12392326944. Its totient is φ = 12048095500.

The previous prime is 12220211173. The next prime is 12220211231. The reversal of 12220211221 is 12211202221.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12220211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220211195 and 12220211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220211231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86057755 + ... + 86057896.

It is an arithmetic number, because the mean of its divisors is an integer number (3098081736).

Almost surely, 2^12220211221 is an apocalyptic number.

It is an amenable number.

12220211221 is a deficient number, since it is larger than the sum of its proper divisors (172115723).

12220211221 is an equidigital number, since it uses as much as digits as its factorization.

12220211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172115722.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12220211221 its reverse (12211202221), we get a palindrome (24431413442).

The spelling of 12220211221 in words is "twelve billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".