12123121225 has 24 divisors (see below), whose sum is σ = 15467045760. Its totient is φ = 9419209920.

The previous prime is 12123121201. The next prime is 12123121289. The reversal of 12123121225 is 52212132121.

It is not a de Polignac number, because 12123121225 - 2⁷ = 12123121097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12123121196 and 12123121205.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 509136 + ... + 532414.

It is an arithmetic number, because the mean of its divisors is an integer number (644460240).

Almost surely, 2^12123121225 is an apocalyptic number.

It is an amenable number.

12123121225 is a deficient number, since it is larger than the sum of its proper divisors (3343924535).

12123121225 is a wasteful number, since it uses less digits than its factorization.

12123121225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23889 (or 23884 counting only the distinct ones).

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

Adding to 12123121225 its reverse (52212132121), we get a palindrome (64335253346).

The spelling of 12123121225 in words is "twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty-five".