12420451 has 2 divisors, whose sum is σ = 12420452. Its totient is φ = 12420450.

The previous prime is 12420413. The next prime is 12420469. The reversal of 12420451 is 15402421.

12420451 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (15402421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12420451 - 2²³ = 4031843 is a prime.

It is not a weakly prime, because it can be changed into another prime (12420151) 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, 6210225 + 6210226.

It is an arithmetic number, because the mean of its divisors is an integer number (6210226).

Almost surely, 2^12420451 is an apocalyptic number.

12420451 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420451 is an equidigital number, since it uses as much as digits as its factorization.

12420451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 12420451 is about 3524.2660228763. The cubic root of 12420451 is about 231.5860819618.

Adding to 12420451 its reverse (15402421), we get a palindrome (27822872).

The spelling of 12420451 in words is "twelve million, four hundred twenty thousand, four hundred fifty-one".