421108564878 has 32 divisors (see below), whose sum is σ = 936411436800. Its totient is φ = 140277327768.

The previous prime is 421108564873. The next prime is 421108564889. The reversal of 421108564878 is 878465801124.

421108564878 is a `hidden beast` number, since 4 + 2 + 1 + 1 + 0 + 8 + 564 + 8 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421108564873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2477938 + ... + 2642421.

It is an arithmetic number, because the mean of its divisors is an integer number (29262857400).

Almost surely, 2^421108564878 is an apocalyptic number.

421108564878 is an abundant number, since it is smaller than the sum of its proper divisors (515302871922).

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

421108564878 is a wasteful number, since it uses less digits than its factorization.

421108564878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121893 (or 5121887 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 421108564878 in words is "four hundred twenty-one billion, one hundred eight million, five hundred sixty-four thousand, eight hundred seventy-eight".