12312120121 has 8 divisors (see below), whose sum is σ = 14079035264. Its totient is φ = 10547215200.

The previous prime is 12312120113. The next prime is 12312120131. The reversal of 12312120121 is 12102121321.

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 12312120121 - 2³ = 12312120113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12312120095 and 12312120104.

It is not an unprimeable number, because it can be changed into a prime (12312120131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489405 + ... + 513946.

It is an arithmetic number, because the mean of its divisors is an integer number (1759879408).

Almost surely, 2^12312120121 is an apocalyptic number.

It is an amenable number.

12312120121 is a deficient number, since it is larger than the sum of its proper divisors (1766915143).

12312120121 is a wasteful number, since it uses less digits than its factorization.

12312120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005111.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12312120121 its reverse (12102121321), we get a palindrome (24414241442).

The spelling of 12312120121 in words is "twelve billion, three hundred twelve million, one hundred twenty thousand, one hundred twenty-one".