12111012211 has 4 divisors (see below), whose sum is σ = 12823424712. Its totient is φ = 11398599712.

The previous prime is 12111012119. The next prime is 12111012257. The reversal of 12111012211 is 11221011121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11221011121 = 43 ⋅260953747.

It is a cyclic number.

It is not a de Polignac number, because 12111012211 - 2¹⁵ = 12110979443 is a prime.

It is a super-2 number, since 2×12111012211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111012191 and 12111012200.

It is not an unprimeable number, because it can be changed into a prime (12111019211) 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, 356206225 + ... + 356206258.

It is an arithmetic number, because the mean of its divisors is an integer number (3205856178).

Almost surely, 2^12111012211 is an apocalyptic number.

12111012211 is a deficient number, since it is larger than the sum of its proper divisors (712412501).

12111012211 is an equidigital number, since it uses as much as digits as its factorization.

12111012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712412500.

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

Adding to 12111012211 its reverse (11221011121), we get a palindrome (23332023332).

The spelling of 12111012211 in words is "twelve billion, one hundred eleven million, twelve thousand, two hundred eleven".