12210221221221 has 8 divisors (see below), whose sum is σ = 16280378485984. Its totient is φ = 8140105718640.

The previous prime is 12210221221207. The next prime is 12210221221243. The reversal of 12210221221221 is 12212212201221.

12210221221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12210221221221 - 2¹⁵ = 12210221188453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210221221201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9751846 + ... + 10932471.

It is an arithmetic number, because the mean of its divisors is an integer number (2035047310748).

Almost surely, 2^{12210221221221} is an apocalyptic number.

It is an amenable number.

12210221221221 is a deficient number, since it is larger than the sum of its proper divisors (4070157264763).

12210221221221 is a wasteful number, since it uses less digits than its factorization.

12210221221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20881091.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12210221221221 its reverse (12212212201221), we get a palindrome (24422433422442).

The spelling of 12210221221221 in words is "twelve trillion, two hundred ten billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".