12012011121 has 16 divisors (see below), whose sum is σ = 17898164928. Its totient is φ = 7102444800.

The previous prime is 12012011117. The next prime is 12012011129. The reversal of 12012011121 is 12111021021.

It is not a de Polignac number, because 12012011121 - 2² = 12012011117 is a prime.

It is a super-2 number, since 2×12012011121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12012011097 and 12012011106.

It is not an unprimeable number, because it can be changed into a prime (12012011129) 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, 4437676 + ... + 4440381.

It is an arithmetic number, because the mean of its divisors is an integer number (1118635308).

Almost surely, 2^12012011121 is an apocalyptic number.

12012011121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012011121 is a deficient number, since it is larger than the sum of its proper divisors (5886153807).

12012011121 is a wasteful number, since it uses less digits than its factorization.

12012011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8878112.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12012011121 its reverse (12111021021), we get a palindrome (24123032142).

The spelling of 12012011121 in words is "twelve billion, twelve million, eleven thousand, one hundred twenty-one".