12500221 has 2 divisors, whose sum is σ = 12500222. Its totient is φ = 12500220.

The previous prime is 12500197. The next prime is 12500227. The reversal of 12500221 is 12200521.

12500221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10208025 + 2292196 = 3195^2 + 1514^2 .

It is an emirp because it is prime and its reverse (12200521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12500221 - 2⁷ = 12500093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12500227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250110 + 6250111.

It is an arithmetic number, because the mean of its divisors is an integer number (6250111).

Almost surely, 2^12500221 is an apocalyptic number.

It is an amenable number.

12500221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12500221 is an equidigital number, since it uses as much as digits as its factorization.

12500221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 12500221 is about 3535.5651599143. The cubic root of 12500221 is about 232.0808093941.

Adding to 12500221 its reverse (12200521), we get a palindrome (24700742).

It can be divided in two parts, 12500 and 221, that added together give a palindrome (12721).

The spelling of 12500221 in words is "twelve million, five hundred thousand, two hundred twenty-one".