12505211245 has 4 divisors (see below), whose sum is σ = 15006253500. Its totient is φ = 10004168992.

The previous prime is 12505211233. The next prime is 12505211269. The reversal of 12505211245 is 54211250521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54211250521 = 37 ⋅1465168933.

It can be written as a sum of positive squares in 2 ways, for example, as 4910785929 + 7594425316 = 70077^2 + 87146^2 .

It is a cyclic number.

It is not a de Polignac number, because 12505211245 - 2⁹ = 12505210733 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1250521120 + ... + 1250521129.

It is an arithmetic number, because the mean of its divisors is an integer number (3751563375).

Almost surely, 2^12505211245 is an apocalyptic number.

It is an amenable number.

12505211245 is a deficient number, since it is larger than the sum of its proper divisors (2501042255).

12505211245 is an equidigital number, since it uses as much as digits as its factorization.

12505211245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501042254.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 12505211245 its reverse (54211250521), we get a palindrome (66716461766).

The spelling of 12505211245 in words is "twelve billion, five hundred five million, two hundred eleven thousand, two hundred forty-five".