421522540 has 48 divisors (see below), whose sum is σ = 921977280. Its totient is φ = 161683200.

The previous prime is 421522501. The next prime is 421522553. The reversal of 421522540 is 45225124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85174 + ... + 89986.

It is an arithmetic number, because the mean of its divisors is an integer number (19207860).

Almost surely, 2^421522540 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 421522540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460988640).

421522540 is an abundant number, since it is smaller than the sum of its proper divisors (500454740).

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

421522540 is a wasteful number, since it uses less digits than its factorization.

421522540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002 (or 5000 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 421522540 is about 20531.0141006235. The cubic root of 421522540 is about 749.7910766216.

Adding to 421522540 its reverse (45225124), we get a palindrome (466747664).

The spelling of 421522540 in words is "four hundred twenty-one million, five hundred twenty-two thousand, five hundred forty".