2221111111 has 4 divisors (see below), whose sum is σ = 2221228800. Its totient is φ = 2220993424.

The previous prime is 2221111103. The next prime is 2221111129. The reversal of 2221111111 is 1111111222.

It is a happy number.

2221111111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2221111111 - 2³ = 2221111103 is a prime.

It is a Duffinian number.

2221111111 is a modest number, since divided by 111111 gives 2221 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 2221111091 and 2221111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221111181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23431 + ... + 70648.

It is an arithmetic number, because the mean of its divisors is an integer number (555307200).

Almost surely, 2^2221111111 is an apocalyptic number.

2221111111 is a deficient number, since it is larger than the sum of its proper divisors (117689).

2221111111 is an equidigital number, since it uses as much as digits as its factorization.

2221111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117688.

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

The square root of 2221111111 is about 47128.6654913971. The cubic root of 2221111111 is about 1304.7383514623.

Adding to 2221111111 its reverse (1111111222), we get a palindrome (3332222333).

It can be divided in two parts, 2221111 and 111, that added together give a palindrome (2221222).

The spelling of 2221111111 in words is "two billion, two hundred twenty-one million, one hundred eleven thousand, one hundred eleven".