12608021 has 2 divisors, whose sum is σ = 12608022. Its totient is φ = 12608020.

The previous prime is 12608017. The next prime is 12608023. The reversal of 12608021 is 12080621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12327121 + 280900 = 3511^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 12608021 - 2² = 12608017 is a prime.

It is a Sophie Germain prime.

Together with 12608023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12607984 and 12608002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12608023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6304010 + 6304011.

It is an arithmetic number, because the mean of its divisors is an integer number (6304011).

Almost surely, 2^12608021 is an apocalyptic number.

It is an amenable number.

12608021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12608021 is an equidigital number, since it uses as much as digits as its factorization.

12608021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 12608021 is about 3550.7775204876. Note that the first 3 decimals coincide. The cubic root of 12608021 is about 232.7460439210.

Adding to 12608021 its reverse (12080621), we get a palindrome (24688642).

The spelling of 12608021 in words is "twelve million, six hundred eight thousand, twenty-one".