12132121121 has 4 divisors (see below), whose sum is σ = 12659604672. Its totient is φ = 11604637572.

The previous prime is 12132121109. The next prime is 12132121147. The reversal of 12132121121 is 12112123121.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 12132121121 - 2²⁶ = 12065012257 is a prime.

It is a super-2 number, since 2×12132121121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12132121121.

It is not an unprimeable number, because it can be changed into a prime (12132121171) 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, 263741741 + ... + 263741786.

It is an arithmetic number, because the mean of its divisors is an integer number (3164901168).

Almost surely, 2^12132121121 is an apocalyptic number.

It is an amenable number.

12132121121 is a deficient number, since it is larger than the sum of its proper divisors (527483551).

12132121121 is an equidigital number, since it uses as much as digits as its factorization.

12132121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527483550.

The product of its digits is 48, while the sum is 17.

Adding to 12132121121 its reverse (12112123121), we get a palindrome (24244244242).

The spelling of 12132121121 in words is "twelve billion, one hundred thirty-two million, one hundred twenty-one thousand, one hundred twenty-one".