421504560 has 200 divisors, whose sum is σ = 1515103920. Its totient is φ = 108476928.

The previous prime is 421504541. The next prime is 421504561. The reversal of 421504560 is 65405124.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (421504561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 186799 + ... + 189041.

Almost surely, 2^421504560 is an apocalyptic number.

421504560 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421504560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757551960).

421504560 is an abundant number, since it is smaller than the sum of its proper divisors (1093599360).

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

421504560 is a wasteful number, since it uses less digits than its factorization.

421504560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297 (or 2282 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 421504560 is about 20530.5762218210. The cubic root of 421504560 is about 749.7804157166.

Adding to 421504560 its reverse (65405124), we get a palindrome (486909684).

The spelling of 421504560 in words is "four hundred twenty-one million, five hundred four thousand, five hundred sixty".