221123111111 has 8 divisors (see below), whose sum is σ = 254530200960. Its totient is φ = 188170539768.

The previous prime is 221123111089. The next prime is 221123111149. The reversal of 221123111111 is 111111321122.

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 221123111111 - 2¹⁸ = 221122848967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221123111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123111311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113628581 + ... + 113630526.

It is an arithmetic number, because the mean of its divisors is an integer number (31816275120).

Almost surely, 2^221123111111 is an apocalyptic number.

221123111111 is a deficient number, since it is larger than the sum of its proper divisors (33407089849).

221123111111 is a wasteful number, since it uses less digits than its factorization.

221123111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227259253.

The product of its digits is 24, while the sum is 17.

Adding to 221123111111 its reverse (111111321122), we get a palindrome (332234432233).

The spelling of 221123111111 in words is "two hundred twenty-one billion, one hundred twenty-three million, one hundred eleven thousand, one hundred eleven".