421056878597 has 2 divisors, whose sum is σ = 421056878598. Its totient is φ = 421056878596.

The previous prime is 421056878591. The next prime is 421056878609. The reversal of 421056878597 is 795878650124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 417763151716 + 3293726881 = 646346^2 + 57391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421056878597 is a prime.

It is a super-3 number, since 3×421056878597³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421056878591) 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, 210528439298 + 210528439299.

It is an arithmetic number, because the mean of its divisors is an integer number (210528439299).

Almost surely, 2^421056878597 is an apocalyptic number.

It is an amenable number.

421056878597 is a deficient number, since it is larger than the sum of its proper divisors (1).

421056878597 is an equidigital number, since it uses as much as digits as its factorization.

421056878597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 421056878597 in words is "four hundred twenty-one billion, fifty-six million, eight hundred seventy-eight thousand, five hundred ninety-seven".