421921560 has 64 divisors (see below), whose sum is σ = 1277416800. Its totient is φ = 111476736.

The previous prime is 421921553. The next prime is 421921601. The reversal of 421921560 is 65129124.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3049 + ... + 29208.

Almost surely, 2^421921560 is an apocalyptic number.

421921560 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 421921560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638708400).

421921560 is an abundant number, since it is smaller than the sum of its proper divisors (855495240).

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

421921560 is a wasteful number, since it uses less digits than its factorization.

421921560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32380 (or 32376 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 421921560 is about 20540.7292957188. The cubic root of 421921560 is about 750.0275900961.

The spelling of 421921560 in words is "four hundred twenty-one million, nine hundred twenty-one thousand, five hundred sixty".