221111120211 has 64 divisors (see below), whose sum is σ = 324804243456. Its totient is φ = 133191475200.

The previous prime is 221111120173. The next prime is 221111120213. The reversal of 221111120211 is 112021111122.

It is a happy number.

It is not a de Polignac number, because 221111120211 - 2¹⁴ = 221111103827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221111120213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 124428555 + ... + 124430331.

It is an arithmetic number, because the mean of its divisors is an integer number (5075066304).

Almost surely, 2^221111120211 is an apocalyptic number.

221111120211 is a deficient number, since it is larger than the sum of its proper divisors (103693123245).

221111120211 is a wasteful number, since it uses less digits than its factorization.

221111120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111120211 its reverse (112021111122), we get a palindrome (333132231333).

It can be divided in two parts, 2211111 and 20211, that added together give a palindrome (2231322).

The spelling of 221111120211 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty thousand, two hundred eleven".