2211121111 has 16 divisors (see below), whose sum is σ = 2287908000. Its totient is φ = 2135973888.

The previous prime is 2211121109. The next prime is 2211121127. The reversal of 2211121111 is 1111211122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2211121111 - 2¹ = 2211121109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211121091 and 2211121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211101111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 851431 + ... + 854023.

It is an arithmetic number, because the mean of its divisors is an integer number (142994250).

Almost surely, 2^2211121111 is an apocalyptic number.

2211121111 is a deficient number, since it is larger than the sum of its proper divisors (76786889).

2211121111 is a wasteful number, since it uses less digits than its factorization.

2211121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898.

The product of its digits is 8, while the sum is 13.

The square root of 2211121111 is about 47022.5595964320. The cubic root of 2211121111 is about 1302.7792829032.

Adding to 2211121111 its reverse (1111211122), we get a palindrome (3322332233).

The spelling of 2211121111 in words is "two billion, two hundred eleven million, one hundred twenty-one thousand, one hundred eleven".