201100201101221 has 4 divisors (see below), whose sum is σ = 201100341230700. Its totient is φ = 201100060971744.

The previous prime is 201100201101169. The next prime is 201100201101287. The reversal of 201100201101221 is 122101102001102.

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 10811667372100 + 190288533729121 = 3288110^2 + 13794511^2 .

It is a cyclic number.

It is not a de Polignac number, because 201100201101221 - 2¹⁸ = 201100200839077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201100201101196 and 201100201101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201100201181221) 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 3 ways as a sum of consecutive naturals, for example, 67889576 + ... + 70789793.

It is an arithmetic number, because the mean of its divisors is an integer number (50275085307675).

Almost surely, 2^{201100201101221} is an apocalyptic number.

It is an amenable number.

201100201101221 is a deficient number, since it is larger than the sum of its proper divisors (140129479).

201100201101221 is a wasteful number, since it uses less digits than its factorization.

201100201101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140129478.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201100201101221 its reverse (122101102001102), we get a palindrome (323201303102323).

The spelling of 201100201101221 in words is "two hundred one trillion, one hundred billion, two hundred one million, one hundred one thousand, two hundred twenty-one".