12111221201 has 4 divisors (see below), whose sum is σ = 12392877552. Its totient is φ = 11829564852.

The previous prime is 12111221191. The next prime is 12111221219. The reversal of 12111221201 is 10212211121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12111221201 - 2³⁰ = 11037479377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12111221231) 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, 140828111 + ... + 140828196.

It is an arithmetic number, because the mean of its divisors is an integer number (3098219388).

Almost surely, 2^12111221201 is an apocalyptic number.

It is an amenable number.

12111221201 is a deficient number, since it is larger than the sum of its proper divisors (281656351).

12111221201 is an equidigital number, since it uses as much as digits as its factorization.

12111221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281656350.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12111221201 its reverse (10212211121), we get a palindrome (22323432322).

The spelling of 12111221201 in words is "twelve billion, one hundred eleven million, two hundred twenty-one thousand, two hundred one".