421751531776 has 81 divisors (see below), whose sum is σ = 866012829339. Its totient is φ = 204989386752.

The previous prime is 421751531771. The next prime is 421751531791. The reversal of 421751531776 is 677135157124.

The square root of 421751531776 is 649424.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 22327531776 + 399424000000 = 149424^2 + 632000^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421751531771) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 384458460 + ... + 384459556.

Almost surely, 2^421751531776 is an apocalyptic number.

421751531776 is the 649424-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421751531776

421751531776 is an abundant number, since it is smaller than the sum of its proper divisors (444261297563).

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

421751531776 is an frugal number, since it uses more digits than its factorization.

421751531776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284 (or 1136 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 49.

Multiplying 421751531776 by its sum of digits (49), we get a square (20665825057024 = 4545968²).

The spelling of 421751531776 in words is "four hundred twenty-one billion, seven hundred fifty-one million, five hundred thirty-one thousand, seven hundred seventy-six".