12040120121 has 4 divisors (see below), whose sum is σ = 12042283044. Its totient is φ = 12037957200.

The previous prime is 12040120111. The next prime is 12040120129. The reversal of 12040120121 is 12102104021.

It is a happy number.

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 2399040400 + 9641079721 = 48980^2 + 98189^2 .

It is a cyclic number.

It is not a de Polignac number, because 12040120121 - 2²⁶ = 11973011257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12040120096 and 12040120105.

It is not an unprimeable number, because it can be changed into a prime (12040120129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073090 + ... + 1084251.

It is an arithmetic number, because the mean of its divisors is an integer number (3010570761).

Almost surely, 2^12040120121 is an apocalyptic number.

It is an amenable number.

12040120121 is a deficient number, since it is larger than the sum of its proper divisors (2162923).

12040120121 is an equidigital number, since it uses as much as digits as its factorization.

12040120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12040120121 its reverse (12102104021), we get a palindrome (24142224142).

The spelling of 12040120121 in words is "twelve billion, forty million, one hundred twenty thousand, one hundred twenty-one".