201221102021101 has 4 divisors (see below), whose sum is σ = 203295546371932. Its totient is φ = 199146657670272.

The previous prime is 201221102021087. The next prime is 201221102021129. The reversal of 201221102021101 is 101120201122102.

201221102021101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43160235426025 + 158060866595076 = 6569645^2 + 12572226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221102021101 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 (201221102021131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037222175270 + ... + 1037222175463.

It is an arithmetic number, because the mean of its divisors is an integer number (50823886592983).

Almost surely, 2^{201221102021101} is an apocalyptic number.

It is an amenable number.

201221102021101 is a deficient number, since it is larger than the sum of its proper divisors (2074444350831).

201221102021101 is an equidigital number, since it uses as much as digits as its factorization.

201221102021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074444350830.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201221102021101 its reverse (101120201122102), we get a palindrome (302341303143203).

The spelling of 201221102021101 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred two million, twenty-one thousand, one hundred one".