12111001121 has 4 divisors (see below), whose sum is σ = 12156023700. Its totient is φ = 12065978544.

The previous prime is 12111001103. The next prime is 12111001159. The reversal of 12111001121 is 12110011121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3918760000 + 8192241121 = 62600^2 + 90511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111001121 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 (12111001171) 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, 22510886 + ... + 22511423.

It is an arithmetic number, because the mean of its divisors is an integer number (3039005925).

Almost surely, 2^12111001121 is an apocalyptic number.

It is an amenable number.

12111001121 is a deficient number, since it is larger than the sum of its proper divisors (45022579).

12111001121 is an equidigital number, since it uses as much as digits as its factorization.

12111001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45022578.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12111001121 its reverse (12110011121), we get a palindrome (24221012242).

The spelling of 12111001121 in words is "twelve billion, one hundred eleven million, one thousand, one hundred twenty-one".