420335921 has 2 divisors, whose sum is σ = 420335922. Its totient is φ = 420335920.

The previous prime is 420335891. The next prime is 420335953. The reversal of 420335921 is 129533024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412293025 + 8042896 = 20305^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 420335921 - 2⁶ = 420335857 is a prime.

It is not a weakly prime, because it can be changed into another prime (420335521) 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, 210167960 + 210167961.

It is an arithmetic number, because the mean of its divisors is an integer number (210167961).

Almost surely, 2^420335921 is an apocalyptic number.

It is an amenable number.

420335921 is a deficient number, since it is larger than the sum of its proper divisors (1).

420335921 is an equidigital number, since it uses as much as digits as its factorization.

420335921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 420335921 is about 20502.0955270431. The cubic root of 420335921 is about 749.0868418259.

Adding to 420335921 its reverse (129533024), we get a palindrome (549868945).

The spelling of 420335921 in words is "four hundred twenty million, three hundred thirty-five thousand, nine hundred twenty-one".