421758508417 has 2 divisors, whose sum is σ = 421758508418. Its totient is φ = 421758508416.

The previous prime is 421758508411. The next prime is 421758508433. The reversal of 421758508417 is 714805857124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405789384256 + 15969124161 = 637016^2 + 126369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421758508417 is a prime.

It is not a weakly prime, because it can be changed into another prime (421758508411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210879254208 + 210879254209.

It is an arithmetic number, because the mean of its divisors is an integer number (210879254209).

Almost surely, 2^421758508417 is an apocalyptic number.

It is an amenable number.

421758508417 is a deficient number, since it is larger than the sum of its proper divisors (1).

421758508417 is an equidigital number, since it uses as much as digits as its factorization.

421758508417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2508800, while the sum is 52.

The spelling of 421758508417 in words is "four hundred twenty-one billion, seven hundred fifty-eight million, five hundred eight thousand, four hundred seventeen".