12102220221 has 64 divisors (see below), whose sum is σ = 21470668800. Its totient is φ = 5884068096.

The previous prime is 12102220217. The next prime is 12102220237. The reversal of 12102220221 is 12202220121.

It is not a de Polignac number, because 12102220221 - 2² = 12102220217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12102220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102220241) 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 63 ways as a sum of consecutive naturals, for example, 160390 + ... + 223448.

It is an arithmetic number, because the mean of its divisors is an integer number (335479200).

Almost surely, 2^12102220221 is an apocalyptic number.

It is an amenable number.

12102220221 is a deficient number, since it is larger than the sum of its proper divisors (9368448579).

12102220221 is a wasteful number, since it uses less digits than its factorization.

12102220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63138.

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

Adding to 12102220221 its reverse (12202220121), we get a palindrome (24304440342).

The spelling of 12102220221 in words is "twelve billion, one hundred two million, two hundred twenty thousand, two hundred twenty-one".