12121312533 has 8 divisors (see below), whose sum is σ = 17631000096. Its totient is φ = 7346250000.

The previous prime is 12121312531. The next prime is 12121312597. The reversal of 12121312533 is 33521312121.

It is a happy number.

12121312533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12121312533 - 2¹ = 12121312531 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121312531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183656218 + ... + 183656283.

It is an arithmetic number, because the mean of its divisors is an integer number (2203875012).

Almost surely, 2^12121312533 is an apocalyptic number.

It is an amenable number.

12121312533 is a deficient number, since it is larger than the sum of its proper divisors (5509687563).

12121312533 is a wasteful number, since it uses less digits than its factorization.

12121312533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367312515.

The product of its digits is 1080, while the sum is 24.

Adding to 12121312533 its reverse (33521312121), we get a palindrome (45642624654).

The spelling of 12121312533 in words is "twelve billion, one hundred twenty-one million, three hundred twelve thousand, five hundred thirty-three".