12512322121 has 12 divisors (see below), whose sum is σ = 13701096540. Its totient is φ = 11420048640.

The previous prime is 12512322113. The next prime is 12512322131. The reversal of 12512322121 is 12122321521.

12512322121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 6836809225 + 5675512896 = 82685^2 + 75336^2 .

It is not a de Polignac number, because 12512322121 - 2³ = 12512322113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12512322092 and 12512322101.

It is not an unprimeable number, because it can be changed into a prime (12512322101) 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 11 ways as a sum of consecutive naturals, for example, 400900 + ... + 430981.

It is an arithmetic number, because the mean of its divisors is an integer number (1141758045).

Almost surely, 2^12512322121 is an apocalyptic number.

It is an amenable number.

12512322121 is a deficient number, since it is larger than the sum of its proper divisors (1188774419).

12512322121 is an equidigital number, since it uses as much as digits as its factorization.

12512322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831996 (or 831983 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

Adding to 12512322121 its reverse (12122321521), we get a palindrome (24634643642).

The spelling of 12512322121 in words is "twelve billion, five hundred twelve million, three hundred twenty-two thousand, one hundred twenty-one".