12111001221211 has 4 divisors (see below), whose sum is σ = 12111045542424. Its totient is φ = 12110956900000.

The previous prime is 12111001221199. The next prime is 12111001221289. The reversal of 12111001221211 is 11212210011121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12111001221211 - 2¹³ = 12111001213019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111001221511) 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, 21748165 + ... + 22298086.

It is an arithmetic number, because the mean of its divisors is an integer number (3027761385606).

Almost surely, 2^{12111001221211} is an apocalyptic number.

12111001221211 is a deficient number, since it is larger than the sum of its proper divisors (44321213).

12111001221211 is an equidigital number, since it uses as much as digits as its factorization.

12111001221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44321212.

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

Adding to 12111001221211 its reverse (11212210011121), we get a palindrome (23323211232332).

The spelling of 12111001221211 in words is "twelve trillion, one hundred eleven billion, one million, two hundred twenty-one thousand, two hundred eleven".