12258721 has 2 divisors, whose sum is σ = 12258722. Its totient is φ = 12258720.

The previous prime is 12258703. The next prime is 12258731. The reversal of 12258721 is 12785221.

12258721 is digitally balanced in base 2 and base 3, because in such bases 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., 6305121 + 5953600 = 2511^2 + 2440^2 .

It is an emirp because it is prime and its reverse (12785221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12258721 - 2⁹ = 12258209 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12258721.

It is not a weakly prime, because it can be changed into another prime (12258731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6129360 + 6129361.

It is an arithmetic number, because the mean of its divisors is an integer number (6129361).

Almost surely, 2^12258721 is an apocalyptic number.

It is an amenable number.

12258721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12258721 is an equidigital number, since it uses as much as digits as its factorization.

12258721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 12258721 is about 3501.2456354846. The cubic root of 12258721 is about 230.5765058644.

The spelling of 12258721 in words is "twelve million, two hundred fifty-eight thousand, seven hundred twenty-one".