12421601 has 2 divisors, whose sum is σ = 12421602. Its totient is φ = 12421600.

The previous prime is 12421597. The next prime is 12421621. The reversal of 12421601 is 10612421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12418576 + 3025 = 3524^2 + 55^2 .

It is an emirp because it is prime and its reverse (10612421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12421601 - 2² = 12421597 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 12421601.

It is not a weakly prime, because it can be changed into another prime (12421621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210800 + 6210801.

It is an arithmetic number, because the mean of its divisors is an integer number (6210801).

Almost surely, 2^12421601 is an apocalyptic number.

It is an amenable number.

12421601 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421601 is an equidigital number, since it uses as much as digits as its factorization.

12421601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 12421601 is about 3524.4291736393. The cubic root of 12421601 is about 231.5932292002.

The spelling of 12421601 in words is "twelve million, four hundred twenty-one thousand, six hundred one".