12111212211 has 32 divisors (see below), whose sum is σ = 18607142400. Its totient is φ = 6863906304.

The previous prime is 12111212209. The next prime is 12111212213. The reversal of 12111212211 is 11221211121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12111212209) and next prime (12111212213).

It is not a de Polignac number, because 12111212211 - 2¹ = 12111212209 is a prime.

It is a super-2 number, since 2×12111212211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12111212213) 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 31 ways as a sum of consecutive naturals, for example, 1569240 + ... + 1576938.

It is an arithmetic number, because the mean of its divisors is an integer number (581473200).

Almost surely, 2^12111212211 is an apocalyptic number.

12111212211 is a deficient number, since it is larger than the sum of its proper divisors (6495930189).

12111212211 is a wasteful number, since it uses less digits than its factorization.

12111212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8315.

The product of its digits is 16, while the sum is 15.

Adding to 12111212211 its reverse (11221211121), we get a palindrome (23332423332).

The spelling of 12111212211 in words is "twelve billion, one hundred eleven million, two hundred twelve thousand, two hundred eleven".