221111121121 has 16 divisors (see below), whose sum is σ = 243658928448. Its totient is φ = 198972072000.

The previous prime is 221111121103. The next prime is 221111121157. The reversal of 221111121121 is 121121111122.

It is a cyclic number.

It is not a de Polignac number, because 221111121121 - 2⁵ = 221111121089 is a prime.

It is a super-3 number, since 3×221111121121³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221111121095 and 221111121104.

It is not an unprimeable number, because it can be changed into a prime (221111121181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5092315 + ... + 5135551.

It is an arithmetic number, because the mean of its divisors is an integer number (15228683028).

Almost surely, 2^221111121121 is an apocalyptic number.

It is an amenable number.

221111121121 is a deficient number, since it is larger than the sum of its proper divisors (22547807327).

221111121121 is a wasteful number, since it uses less digits than its factorization.

221111121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47952.

The product of its digits is 16, while the sum is 16.

Adding to 221111121121 its reverse (121121111122), we get a palindrome (342232232243).

Subtracting from 221111121121 its reverse (121121111122), we obtain a palindrome (99990009999).

The spelling of 221111121121 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".