12012121 has 8 divisors (see below), whose sum is σ = 13152384. Its totient is φ = 10879920.

The previous prime is 12012113. The next prime is 12012131. The reversal of 12012121 is 12121021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12012121 - 2³ = 12012113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012098 and 12012107.

It is not an unprimeable number, because it can be changed into a prime (12012101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1360 + ... + 5086.

It is an arithmetic number, because the mean of its divisors is an integer number (1644048).

Almost surely, 2^12012121 is an apocalyptic number.

12012121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012121 is a deficient number, since it is larger than the sum of its proper divisors (1140263).

12012121 is a wasteful number, since it uses less digits than its factorization.

12012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12012121 is about 3465.8506892248. The cubic root of 12012121 is about 229.0199063567.

Adding to 12012121 its reverse (12121021), we get a palindrome (24133142).

Subtracting 12012121 from its reverse (12121021), we obtain a square (108900 = 330²).

The spelling of 12012121 in words is "twelve million, twelve thousand, one hundred twenty-one".