421563347856 has 480 divisors, whose sum is σ = 1475405568000. Its totient is φ = 113833175040.

The previous prime is 421563347819. The next prime is 421563347857. The reversal of 421563347856 is 658743365124.

421563347856 is a `hidden beast` number, since 4 + 2 + 1 + 563 + 3 + 4 + 78 + 5 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (421563347857) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 309744616 + ... + 309745976.

It is an arithmetic number, because the mean of its divisors is an integer number (3073761600).

Almost surely, 2^421563347856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421563347856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737702784000).

421563347856 is an abundant number, since it is smaller than the sum of its proper divisors (1053842220144).

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

421563347856 is a wasteful number, since it uses less digits than its factorization.

421563347856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009 (or 1991 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The spelling of 421563347856 in words is "four hundred twenty-one billion, five hundred sixty-three million, three hundred forty-seven thousand, eight hundred fifty-six".