12138124225 has 12 divisors (see below), whose sum is σ = 15053903676. Its totient is φ = 9708802880.

The previous prime is 12138124189. The next prime is 12138124231. The reversal of 12138124225 is 52242183121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 626550961 + 11511573264 = 25031^2 + 107292^2 .

It is not a de Polignac number, because 12138124225 - 2¹¹ = 12138122177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114999 + ... + 193651.

It is an arithmetic number, because the mean of its divisors is an integer number (1254491973).

Almost surely, 2^12138124225 is an apocalyptic number.

It is an amenable number.

12138124225 is a deficient number, since it is larger than the sum of its proper divisors (2915779451).

12138124225 is an equidigital number, since it uses as much as digits as its factorization.

12138124225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84836 (or 84831 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The spelling of 12138124225 in words is "twelve billion, one hundred thirty-eight million, one hundred twenty-four thousand, two hundred twenty-five".