421802540865 has 24 divisors (see below), whose sum is σ = 731685614400. Its totient is φ = 224788675104.

The previous prime is 421802540833. The next prime is 421802540867. The reversal of 421802540865 is 568045208124.

421802540865 is a `hidden beast` number, since 4 + 2 + 180 + 2 + 5 + 408 + 65 = 666.

It is not a de Polignac number, because 421802540865 - 2⁵ = 421802540833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 421802540865.

It is not an unprimeable number, because it can be changed into a prime (421802540867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3538215 + ... + 3655484.

It is an arithmetic number, because the mean of its divisors is an integer number (30486900600).

Almost surely, 2^421802540865 is an apocalyptic number.

421802540865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421802540865 is a deficient number, since it is larger than the sum of its proper divisors (309883073535).

421802540865 is a wasteful number, since it uses less digits than its factorization.

421802540865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7195013 (or 7195010 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

Adding to 421802540865 its reverse (568045208124), we get a palindrome (989847748989).

The spelling of 421802540865 in words is "four hundred twenty-one billion, eight hundred two million, five hundred forty thousand, eight hundred sixty-five".