221201122211 has 4 divisors (see below), whose sum is σ = 221236368432. Its totient is φ = 221165875992.

The previous prime is 221201122199. The next prime is 221201122253. The reversal of 221201122211 is 112221102122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201122211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221201122211.

It is not an unprimeable number, because it can be changed into a prime (221201122271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17613695 + ... + 17626248.

It is an arithmetic number, because the mean of its divisors is an integer number (55309092108).

Almost surely, 2^221201122211 is an apocalyptic number.

221201122211 is a deficient number, since it is larger than the sum of its proper divisors (35246221).

221201122211 is an equidigital number, since it uses as much as digits as its factorization.

221201122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35246220.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221201122211 its reverse (112221102122), we get a palindrome (333422224333).

The spelling of 221201122211 in words is "two hundred twenty-one billion, two hundred one million, one hundred twenty-two thousand, two hundred eleven".