201211202102221 has 16 divisors (see below), whose sum is σ = 206449969397760. Its totient is φ = 195997945132080.

The previous prime is 201211202102159. The next prime is 201211202102227. The reversal of 201211202102221 is 122201202112102.

It is a cyclic number.

It is not a de Polignac number, because 201211202102221 - 2²¹ = 201211200005069 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 (201211202102227) 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, 210128436 + ... + 211083826.

It is an arithmetic number, because the mean of its divisors is an integer number (12903123087360).

Almost surely, 2^{201211202102221} is an apocalyptic number.

It is an amenable number.

201211202102221 is a deficient number, since it is larger than the sum of its proper divisors (5238767295539).

201211202102221 is a wasteful number, since it uses less digits than its factorization.

201211202102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968736.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201211202102221 its reverse (122201202112102), we get a palindrome (323412404214323).

The spelling of 201211202102221 in words is "two hundred one trillion, two hundred eleven billion, two hundred two million, one hundred two thousand, two hundred twenty-one".