12505211 has 4 divisors (see below), whose sum is σ = 13163400. Its totient is φ = 11847024.

The previous prime is 12505189. The next prime is 12505219. The reversal of 12505211 is 11250521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12505211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12505211.

It is not an unprimeable number, because it can be changed into a prime (12505219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329066 + ... + 329103.

It is an arithmetic number, because the mean of its divisors is an integer number (3290850).

Almost surely, 2^12505211 is an apocalyptic number.

12505211 is a deficient number, since it is larger than the sum of its proper divisors (658189).

12505211 is an equidigital number, since it uses as much as digits as its factorization.

12505211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658188.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12505211 is about 3536.2707758315. The cubic root of 12505211 is about 232.1116869595. Note that the first 3 decimals are identical.

Adding to 12505211 its reverse (11250521), we get a palindrome (23755732).

The spelling of 12505211 in words is "twelve million, five hundred five thousand, two hundred eleven".