1222011211 has 4 divisors (see below), whose sum is σ = 1222871392. Its totient is φ = 1221151032.

The previous prime is 1222011199. The next prime is 1222011223. The reversal of 1222011211 is 1121102221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1121102221 = 5233 ⋅214237.

It is an interprime number because it is at equal distance from previous prime (1222011199) and next prime (1222011223).

It is a cyclic number.

It is not a de Polignac number, because 1222011211 - 2¹⁹ = 1221486923 is a prime.

It is a super-2 number, since 2×1222011211² = 2986622799619373042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222011191 and 1222011200.

It is not an unprimeable number, because it can be changed into a prime (1222011911) 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, 427956 + ... + 430801.

It is an arithmetic number, because the mean of its divisors is an integer number (305717848).

Almost surely, 2^1222011211 is an apocalyptic number.

1222011211 is a deficient number, since it is larger than the sum of its proper divisors (860181).

1222011211 is an equidigital number, since it uses as much as digits as its factorization.

1222011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860180.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1222011211 is about 34957.2769391439. The cubic root of 1222011211 is about 1069.1165768447.

Adding to 1222011211 its reverse (1121102221), we get a palindrome (2343113432).

The spelling of 1222011211 in words is "one billion, two hundred twenty-two million, eleven thousand, two hundred eleven".