1222111211 has 4 divisors (see below), whose sum is σ = 1234211424. Its totient is φ = 1210011000.

The previous prime is 1222111207. The next prime is 1222111273. The reversal of 1222111211 is 1121112221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1121112221 = 101 ⋅11100121.

It is a cyclic number.

It is not a de Polignac number, because 1222111211 - 2² = 1222111207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222111201) 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, 6049955 + ... + 6050156.

It is an arithmetic number, because the mean of its divisors is an integer number (308552856).

Almost surely, 2^1222111211 is an apocalyptic number.

1222111211 is a deficient number, since it is larger than the sum of its proper divisors (12100213).

1222111211 is a wasteful number, since it uses less digits than its factorization.

1222111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12100212.

The product of its digits is 16, while the sum is 14.

The square root of 1222111211 is about 34958.7072272417. The cubic root of 1222111211 is about 1069.1457388089.

Adding to 1222111211 its reverse (1121112221), we get a palindrome (2343223432).

It can be divided in two parts, 12221 and 11211, that added together give a palindrome (23432).

The spelling of 1222111211 in words is "one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred eleven".