201222211100221 has 4 divisors (see below), whose sum is σ = 205018856592732. Its totient is φ = 197425565607712.

The previous prime is 201222211100213. The next prime is 201222211100231. The reversal of 201222211100221 is 122001112222102.

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 52819259794596 + 148402951305625 = 7267686^2 + 12182075^2 .

It is a cyclic number.

It is not a de Polignac number, because 201222211100221 - 2³ = 201222211100213 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 (201222211100231) 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, 1898322746176 + ... + 1898322746281.

It is an arithmetic number, because the mean of its divisors is an integer number (51254714148183).

Almost surely, 2^{201222211100221} is an apocalyptic number.

It is an amenable number.

201222211100221 is a deficient number, since it is larger than the sum of its proper divisors (3796645492511).

201222211100221 is an equidigital number, since it uses as much as digits as its factorization.

201222211100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796645492510.

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

Adding to 201222211100221 its reverse (122001112222102), we get a palindrome (323223323322323).

The spelling of 201222211100221 in words is "two hundred one trillion, two hundred twenty-two billion, two hundred eleven million, one hundred thousand, two hundred twenty-one".