12002112121 has 4 divisors (see below), whose sum is σ = 12030757200. Its totient is φ = 11973467044.

The previous prime is 12002112107. The next prime is 12002112137. The reversal of 12002112121 is 12121120021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12121120021 = 79 ⋅153431899.

It is a cyclic number.

It is not a de Polignac number, because 12002112121 - 2¹³ = 12002103929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12002112151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14321911 + ... + 14322748.

It is an arithmetic number, because the mean of its divisors is an integer number (3007689300).

Almost surely, 2^12002112121 is an apocalyptic number.

It is an amenable number.

12002112121 is a deficient number, since it is larger than the sum of its proper divisors (28645079).

12002112121 is an equidigital number, since it uses as much as digits as its factorization.

12002112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28645078.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12002112121 its reverse (12121120021), we get a palindrome (24123232142).

It can be divided in two parts, 120021 and 12121, that multiplied together give a palindrome (1454774541).

The spelling of 12002112121 in words is "twelve billion, two million, one hundred twelve thousand, one hundred twenty-one".