421563961980 has 144 divisors (see below), whose sum is σ = 1464019974144. Its totient is φ = 96186165120.

The previous prime is 421563961963. The next prime is 421563961991. The reversal of 421563961980 is 89169365124.

421563961980 is a `hidden beast` number, since 4 + 2 + 15 + 6 + 3 + 9 + 619 + 8 + 0 = 666.

421563961980 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 412245 + ... + 1006515.

It is an arithmetic number, because the mean of its divisors is an integer number (10166805376).

Almost surely, 2^421563961980 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 421563961980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732009987072).

421563961980 is an abundant number, since it is smaller than the sum of its proper divisors (1042456012164).

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

421563961980 is a wasteful number, since it uses less digits than its factorization.

421563961980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594856 (or 594851 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 421563961980 in words is "four hundred twenty-one billion, five hundred sixty-three million, nine hundred sixty-one thousand, nine hundred eighty".