201221100001211 has 4 divisors (see below), whose sum is σ = 201221138825112. Its totient is φ = 201221061177312.

The previous prime is 201221100001189. The next prime is 201221100001231. The reversal of 201221100001211 is 112100001122102.

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

It is a cyclic number.

It is not a de Polignac number, because 201221100001211 - 2⁶ = 201221100001147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221100001231) 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, 10171301 + ... + 22492166.

It is an arithmetic number, because the mean of its divisors is an integer number (50305284706278).

Almost surely, 2^{201221100001211} is an apocalyptic number.

201221100001211 is a deficient number, since it is larger than the sum of its proper divisors (38823901).

201221100001211 is an equidigital number, since it uses as much as digits as its factorization.

201221100001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38823900.

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

Adding to 201221100001211 its reverse (112100001122102), we get a palindrome (313321101123313).

The spelling of 201221100001211 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred million, one thousand, two hundred eleven".