12342721 has 2 divisors, whose sum is σ = 12342722. Its totient is φ = 12342720.

The previous prime is 12342703. The next prime is 12342727. The reversal of 12342721 is 12724321.

12342721 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., 9241600 + 3101121 = 3040^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 12342721 - 2¹⁵ = 12309953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12342692 and 12342701.

It is not a weakly prime, because it can be changed into another prime (12342727) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6171360 + 6171361.

It is an arithmetic number, because the mean of its divisors is an integer number (6171361).

Almost surely, 2^12342721 is an apocalyptic number.

It is an amenable number.

12342721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12342721 is an equidigital number, since it uses as much as digits as its factorization.

12342721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 12342721 is about 3513.2208868786. The cubic root of 12342721 is about 231.1019645682.

The spelling of 12342721 in words is "twelve million, three hundred forty-two thousand, seven hundred twenty-one".