12132121 has 4 divisors (see below), whose sum is σ = 12550500. Its totient is φ = 11713744.

The previous prime is 12132103. The next prime is 12132151. The reversal of 12132121 is 12123121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12123121 = 19 ⋅638059.

It can be written as a sum of positive squares in 2 ways, for example, as 9455625 + 2676496 = 3075^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 12132121 - 2¹¹ = 12130073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12132151) 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 3 ways as a sum of consecutive naturals, for example, 209146 + ... + 209203.

It is an arithmetic number, because the mean of its divisors is an integer number (3137625).

Almost surely, 2^12132121 is an apocalyptic number.

It is an amenable number.

12132121 is a deficient number, since it is larger than the sum of its proper divisors (418379).

12132121 is an equidigital number, since it uses as much as digits as its factorization.

12132121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418378.

The product of its digits is 24, while the sum is 13.

The square root of 12132121 is about 3483.1194352190. The cubic root of 12132121 is about 229.7800101937.

Adding to 12132121 its reverse (12123121), we get a palindrome (24255242).

The spelling of 12132121 in words is "twelve million, one hundred thirty-two thousand, one hundred twenty-one".