221131111111211 has 16 divisors (see below), whose sum is σ = 270383412092160. Its totient is φ = 176621422402080.

The previous prime is 221131111111201. The next prime is 221131111111231. The reversal of 221131111111211 is 112111111131122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221131111111211 - 2³⁰ = 221130037369387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221131111111201) 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 15 ways as a sum of consecutive naturals, for example, 13628188061 + ... + 13628204286.

It is an arithmetic number, because the mean of its divisors is an integer number (16898963255760).

Almost surely, 2^{221131111111211} is an apocalyptic number.

221131111111211 is a deficient number, since it is larger than the sum of its proper divisors (49252300980949).

221131111111211 is a wasteful number, since it uses less digits than its factorization.

221131111111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27256392434.

The product of its digits is 24, while the sum is 20.

Adding to 221131111111211 its reverse (112111111131122), we get a palindrome (333242222242333).

The spelling of 221131111111211 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".