421216459 has 2 divisors, whose sum is σ = 421216460. Its totient is φ = 421216458.

The previous prime is 421216423. The next prime is 421216487. The reversal of 421216459 is 954612124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421216459 - 2⁷ = 421216331 is a prime.

It is not a weakly prime, because it can be changed into another prime (421216409) 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, 210608229 + 210608230.

It is an arithmetic number, because the mean of its divisors is an integer number (210608230).

Almost surely, 2^421216459 is an apocalyptic number.

421216459 is a deficient number, since it is larger than the sum of its proper divisors (1).

421216459 is an equidigital number, since it uses as much as digits as its factorization.

421216459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 421216459 is about 20523.5586339212. The cubic root of 421216459 is about 749.6095502487.

The spelling of 421216459 in words is "four hundred twenty-one million, two hundred sixteen thousand, four hundred fifty-nine".