421720604646 has 128 divisors (see below), whose sum is σ = 978082947072. Its totient is φ = 120060192000.

The previous prime is 421720604611. The next prime is 421720604677. The reversal of 421720604646 is 646406027124.

It is a junction number, because it is equal to n+sod(n) for n = 421720604598 and 421720604607.

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 63 ways as a sum of consecutive naturals, for example, 8235895 + ... + 8286941.

It is an arithmetic number, because the mean of its divisors is an integer number (7641273024).

Almost surely, 2^421720604646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421720604646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (489041473536).

421720604646 is an abundant number, since it is smaller than the sum of its proper divisors (556362342426).

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

421720604646 is a wasteful number, since it uses less digits than its factorization.

421720604646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51218.

The product of its (nonzero) digits is 387072, while the sum is 42.

The spelling of 421720604646 in words is "four hundred twenty-one billion, seven hundred twenty million, six hundred four thousand, six hundred forty-six".