421016240 has 20 divisors (see below), whose sum is σ = 978862944. Its totient is φ = 168406464.

The previous prime is 421016227. The next prime is 421016243. The reversal of 421016240 is 42610124.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (421016243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2631272 + ... + 2631431.

Almost surely, 2^421016240 is an apocalyptic number.

421016240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421016240 is an abundant number, since it is smaller than the sum of its proper divisors (557846704).

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

421016240 is a wasteful number, since it uses less digits than its factorization.

421016240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5262716 (or 5262710 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 421016240 is about 20518.6802694520. The cubic root of 421016240 is about 749.4907594956.

Adding to 421016240 its reverse (42610124), we get a palindrome (463626364).

The spelling of 421016240 in words is "four hundred twenty-one million, sixteen thousand, two hundred forty".