12212101221 has 4 divisors (see below), whose sum is σ = 16282801632. Its totient is φ = 8141400812.

The previous prime is 12212101171. The next prime is 12212101277. The reversal of 12212101221 is 12210121221.

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 not a de Polignac number, because 12212101221 - 2¹³ = 12212093029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12212101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212101621) 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 3 ways as a sum of consecutive naturals, for example, 2035350201 + ... + 2035350206.

It is an arithmetic number, because the mean of its divisors is an integer number (4070700408).

Almost surely, 2^12212101221 is an apocalyptic number.

It is an amenable number.

12212101221 is a deficient number, since it is larger than the sum of its proper divisors (4070700411).

12212101221 is an equidigital number, since it uses as much as digits as its factorization.

12212101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070700410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12212101221 its reverse (12210121221), we get a palindrome (24422222442).

The spelling of 12212101221 in words is "twelve billion, two hundred twelve million, one hundred one thousand, two hundred twenty-one".