1222111111 has 4 divisors (see below), whose sum is σ = 1316119672. Its totient is φ = 1128102552.

The previous prime is 1222111097. The next prime is 1222111117. The reversal of 1222111111 is 1111112221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222111111 - 2⁹ = 1222110599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 94008547 = 1222111111 / (1 + 2 + 2 + 2 + 1 + 1 + 1 + 1 + 1 + 1).

It is a Duffinian number.

1222111111 is a modest number, since divided by 111111 gives 1222 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1222111091 and 1222111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222111117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47004261 + ... + 47004286.

It is an arithmetic number, because the mean of its divisors is an integer number (329029918).

Almost surely, 2^1222111111 is an apocalyptic number.

1222111111 is a deficient number, since it is larger than the sum of its proper divisors (94008561).

1222111111 is an equidigital number, since it uses as much as digits as its factorization.

1222111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94008560.

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

The square root of 1222111111 is about 34958.7057969828. The cubic root of 1222111111 is about 1069.1457096477.

Adding to 1222111111 its reverse (1111112221), we get a palindrome (2333223332).

It can be divided in two parts, 12221 and 11111, that multiplied together give a palindrome (135787531).

The spelling of 1222111111 in words is "one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred eleven".