201221002122111 has 12 divisors (see below), whose sum is σ = 291323811648688. Its totient is φ = 133837525658304.

The previous prime is 201221002122089. The next prime is 201221002122191. The reversal of 201221002122111 is 111221200122102.

201221002122111 is a `hidden beast` number, since 20 + 1 + 221 + 0 + 0 + 212 + 211 + 1 = 666.

It is not a de Polignac number, because 201221002122111 - 2¹⁷ = 201221001991039 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 (201221002122191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25817420035 + ... + 25817427828.

Almost surely, 2^{201221002122111} is an apocalyptic number.

201221002122111 is a deficient number, since it is larger than the sum of its proper divisors (90102809526577).

201221002122111 is a wasteful number, since it uses less digits than its factorization.

201221002122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51634848302 (or 51634848299 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 201221002122111 its reverse (111221200122102), we get a palindrome (312442202244213).

The spelling of 201221002122111 in words is "two hundred one trillion, two hundred twenty-one billion, two million, one hundred twenty-two thousand, one hundred eleven".