221011011111 has 16 divisors (see below), whose sum is σ = 321489371520. Its totient is φ = 133938229920.

The previous prime is 221011011097. The next prime is 221011011157. The reversal of 221011011111 is 111110110122.

221011011111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221011011111 - 2⁵ = 221011011079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011016111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404016 + ... + 777978.

It is an arithmetic number, because the mean of its divisors is an integer number (20093085720).

Almost surely, 2^221011011111 is an apocalyptic number.

221011011111 is a deficient number, since it is larger than the sum of its proper divisors (100478360409).

221011011111 is a wasteful number, since it uses less digits than its factorization.

221011011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391886.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 221011011111 its reverse (111110110122), we get a palindrome (332121121233).

It can be divided in two parts, 2210110111 and 11, that added together give a palindrome (2210110122).

The spelling of 221011011111 in words is "two hundred twenty-one billion, eleven million, eleven thousand, one hundred eleven".