12001111121 has 16 divisors (see below), whose sum is σ = 12882608640. Its totient is φ = 11139448320.

The previous prime is 12001111091. The next prime is 12001111141. The reversal of 12001111121 is 12111110021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001111121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12001111141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1294061 + ... + 1303301.

It is an arithmetic number, because the mean of its divisors is an integer number (805163040).

Almost surely, 2^12001111121 is an apocalyptic number.

It is an amenable number.

12001111121 is a deficient number, since it is larger than the sum of its proper divisors (881497519).

12001111121 is an equidigital number, since it uses as much as digits as its factorization.

12001111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304.

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

Adding to 12001111121 its reverse (12111110021), we get a palindrome (24112221142).

The spelling of 12001111121 in words is "twelve billion, one million, one hundred eleven thousand, one hundred twenty-one".