12998221 has 2 divisors, whose sum is σ = 12998222. Its totient is φ = 12998220.

The previous prime is 12998171. The next prime is 12998263. The reversal of 12998221 is 12289921.

12998221 is digitally balanced in base 2, 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., 11485321 + 1512900 = 3389^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 12998221 - 2⁷ = 12998093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12998281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6499110 + 6499111.

It is an arithmetic number, because the mean of its divisors is an integer number (6499111).

Almost surely, 2^12998221 is an apocalyptic number.

It is an amenable number.

12998221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12998221 is an equidigital number, since it uses as much as digits as its factorization.

12998221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 12998221 is about 3605.3045641111. The cubic root of 12998221 is about 235.1227425792.

The spelling of 12998221 in words is "twelve million, nine hundred ninety-eight thousand, two hundred twenty-one".