1212222211211 has 16 divisors (see below), whose sum is σ = 1338705446400. Its totient is φ = 1088504604000.

The previous prime is 1212222211169. The next prime is 1212222211237. The reversal of 1212222211211 is 1121122222121.

It is not a de Polignac number, because 1212222211211 - 2¹⁸ = 1212221949067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212222211111) 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, 836531 + ... + 1767548.

It is an arithmetic number, because the mean of its divisors is an integer number (83669090400).

Almost surely, 2^{1212222211211} is an apocalyptic number.

1212222211211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212222211211 is a deficient number, since it is larger than the sum of its proper divisors (126483235189).

1212222211211 is a wasteful number, since it uses less digits than its factorization.

1212222211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604610.

The product of its digits is 128, while the sum is 20.

Adding to 1212222211211 its reverse (1121122222121), we get a palindrome (2333344433332).

The spelling of 1212222211211 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred eleven thousand, two hundred eleven".