201221110101 has 48 divisors (see below), whose sum is σ = 307121472000. Its totient is φ = 116955780480.

The previous prime is 201221110063. The next prime is 201221110121. The reversal of 201221110101 is 101011122102.

It is not a de Polignac number, because 201221110101 - 2³⁰ = 200147368277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221110121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1504380 + ... + 1632666.

It is an arithmetic number, because the mean of its divisors is an integer number (6398364000).

Almost surely, 2^201221110101 is an apocalyptic number.

It is an amenable number.

201221110101 is a deficient number, since it is larger than the sum of its proper divisors (105900361899).

201221110101 is a wasteful number, since it uses less digits than its factorization.

201221110101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128490 (or 128479 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 201221110101 its reverse (101011122102), we get a palindrome (302232232203).

The spelling of 201221110101 in words is "two hundred one billion, two hundred twenty-one million, one hundred ten thousand, one hundred one".