421802540864 has 56 divisors (see below), whose sum is σ = 865406524200. Its totient is φ = 203823876096.

The previous prime is 421802540833. The next prime is 421802540867. The reversal of 421802540864 is 468045208124.

It can be written as a sum of positive squares in 4 ways, for example, as 67491883264 + 354310657600 = 259792^2 + 595240^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 244907 + ... + 950570.

Almost surely, 2^421802540864 is an apocalyptic number.

It is an amenable number.

421802540864 is an abundant number, since it is smaller than the sum of its proper divisors (443603983336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421802540864 is a wasteful number, since it uses less digits than its factorization.

421802540864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195675 (or 1195665 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 44.

Adding to 421802540864 its reverse (468045208124), we get a palindrome (889847748988).

The spelling of 421802540864 in words is "four hundred twenty-one billion, eight hundred two million, five hundred forty thousand, eight hundred sixty-four".