12001210221221 has 16 divisors (see below), whose sum is σ = 12943092563520. Its totient is φ = 11062008397440.

The previous prime is 12001210221139. The next prime is 12001210221229. The reversal of 12001210221221 is 12212201210021.

It is not a de Polignac number, because 12001210221221 - 2⁴² = 7603163710117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12001210221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001210221229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39726881 + ... + 40027833.

It is an arithmetic number, because the mean of its divisors is an integer number (808943285220).

Almost surely, 2^{12001210221221} is an apocalyptic number.

It is an amenable number.

12001210221221 is a deficient number, since it is larger than the sum of its proper divisors (941882342299).

12001210221221 is a wasteful number, since it uses less digits than its factorization.

12001210221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305396.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12001210221221 its reverse (12212201210021), we get a palindrome (24213411431242).

The spelling of 12001210221221 in words is "twelve trillion, one billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".