12011120121 has 32 divisors (see below), whose sum is σ = 21502430208. Its totient is φ = 5759576640.

The previous prime is 12011120111. The next prime is 12011120129. The reversal of 12011120121 is 12102111021.

It is not a de Polignac number, because 12011120121 - 2⁶ = 12011120057 is a prime.

It is a super-2 number, since 2×12011120121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12011120097 and 12011120106.

It is not an unprimeable number, because it can be changed into a prime (12011120129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1996851 + ... + 2002856.

It is an arithmetic number, because the mean of its divisors is an integer number (671950944).

Almost surely, 2^12011120121 is an apocalyptic number.

12011120121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011120121 is a deficient number, since it is larger than the sum of its proper divisors (9491310087).

12011120121 is a wasteful number, since it uses less digits than its factorization.

12011120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999741.

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

Adding to 12011120121 its reverse (12102111021), we get a palindrome (24113231142).

The spelling of 12011120121 in words is "twelve billion, eleven million, one hundred twenty thousand, one hundred twenty-one".