12221210221 has 8 divisors (see below), whose sum is σ = 13333173984. Its totient is φ = 11109403920.

The previous prime is 12221210201. The next prime is 12221210227. The reversal of 12221210221 is 12201212221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221210221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221210195 and 12221210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221210227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172551 + ... + 232843.

It is an arithmetic number, because the mean of its divisors is an integer number (1666646748).

Almost surely, 2^12221210221 is an apocalyptic number.

12221210221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221210221 is a deficient number, since it is larger than the sum of its proper divisors (1111963763).

12221210221 is a wasteful number, since it uses less digits than its factorization.

12221210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78731.

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

Adding to 12221210221 its reverse (12201212221), we get a palindrome (24422422442).

The spelling of 12221210221 in words is "twelve billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".