201211100000221 has 2 divisors, whose sum is σ = 201211100000222. Its totient is φ = 201211100000220.

The previous prime is 201211100000189. The next prime is 201211100000237. The reversal of 201211100000221 is 122000001112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111396414802500 + 89814685197721 = 10554450^2 + 9477061^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211100000221 - 2⁵ = 201211100000189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211100000321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605550000110 + 100605550000111.

It is an arithmetic number, because the mean of its divisors is an integer number (100605550000111).

Almost surely, 2^{201211100000221} is an apocalyptic number.

It is an amenable number.

201211100000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211100000221 is an equidigital number, since it uses as much as digits as its factorization.

201211100000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201211100000221 its reverse (122000001112102), we get a palindrome (323211101112323).

The spelling of 201211100000221 in words is "two hundred one trillion, two hundred eleven billion, one hundred million, two hundred twenty-one", and thus it is an aban number.