201221202211221 has 16 divisors (see below), whose sum is σ = 280128889574784. Its totient is φ = 128237531330304.

The previous prime is 201221202211157. The next prime is 201221202211241. The reversal of 201221202211221 is 122112202122102.

201221202211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201221202211221 - 2⁶ = 201221202211157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221202211241) 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, 879864336 + ... + 880093001.

It is an arithmetic number, because the mean of its divisors is an integer number (17508055598424).

Almost surely, 2^{201221202211221} is an apocalyptic number.

It is an amenable number.

201221202211221 is a deficient number, since it is larger than the sum of its proper divisors (78907687363563).

201221202211221 is a wasteful number, since it uses less digits than its factorization.

201221202211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759959020.

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

Adding to 201221202211221 its reverse (122112202122102), we get a palindrome (323333404333323).

The spelling of 201221202211221 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred two million, two hundred eleven thousand, two hundred twenty-one".