221101111111 has 8 divisors (see below), whose sum is σ = 221797982000. Its totient is φ = 220404602880.

The previous prime is 221101111103. The next prime is 221101111141. The reversal of 221101111111 is 111111101122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221101111111 - 2³ = 221101111103 is a prime.

It is a Duffinian number.

221101111111 is a modest number, since divided by 1111111 gives 22110 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 221101111091 and 221101111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101111141) 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 7 ways as a sum of consecutive naturals, for example, 1157575 + ... + 1334983.

It is an arithmetic number, because the mean of its divisors is an integer number (27724747750).

Almost surely, 2^221101111111 is an apocalyptic number.

221101111111 is a deficient number, since it is larger than the sum of its proper divisors (696870889).

221101111111 is a wasteful number, since it uses less digits than its factorization.

221101111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181329.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 221101111111 its reverse (111111101122), we get a palindrome (332212212233).

The spelling of 221101111111 in words is "two hundred twenty-one billion, one hundred one million, one hundred eleven thousand, one hundred eleven".