12111221101 has 4 divisors (see below), whose sum is σ = 13841395552. Its totient is φ = 10381046652.

The previous prime is 12111221099. The next prime is 12111221131. The reversal of 12111221101 is 10112211121.

It is a happy number.

12111221101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12111221101 - 2¹ = 12111221099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111221131) 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 3 ways as a sum of consecutive naturals, for example, 865087215 + ... + 865087228.

It is an arithmetic number, because the mean of its divisors is an integer number (3460348888).

Almost surely, 2^12111221101 is an apocalyptic number.

It is an amenable number.

12111221101 is a deficient number, since it is larger than the sum of its proper divisors (1730174451).

12111221101 is an equidigital number, since it uses as much as digits as its factorization.

12111221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730174450.

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

Adding to 12111221101 its reverse (10112211121), we get a palindrome (22223432222).

The spelling of 12111221101 in words is "twelve billion, one hundred eleven million, two hundred twenty-one thousand, one hundred one".