424364821 has 2 divisors, whose sum is σ = 424364822. Its totient is φ = 424364820.

The previous prime is 424364819. The next prime is 424364849. The reversal of 424364821 is 128463424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411684100 + 12680721 = 20290^2 + 3561^2 .

It is a cyclic number.

It is not a de Polignac number, because 424364821 - 2¹ = 424364819 is a prime.

Together with 424364819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424364851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212182410 + 212182411.

It is an arithmetic number, because the mean of its divisors is an integer number (212182411).

Almost surely, 2^424364821 is an apocalyptic number.

It is an amenable number.

424364821 is a deficient number, since it is larger than the sum of its proper divisors (1).

424364821 is an equidigital number, since it uses as much as digits as its factorization.

424364821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 34.

The square root of 424364821 is about 20600.1170142308. The cubic root of 424364821 is about 751.4725563596.

The spelling of 424364821 in words is "four hundred twenty-four million, three hundred sixty-four thousand, eight hundred twenty-one".