220421824 has 28 divisors (see below), whose sum is σ = 499886224. Its totient is φ = 94466304.

The previous prime is 220421807. The next prime is 220421833. The reversal of 220421824 is 428124022.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245559 + ... + 246454.

Almost surely, 2^220421824 is an apocalyptic number.

It is an amenable number.

220421824 is an abundant number, since it is smaller than the sum of its proper divisors (279464400).

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

220421824 is an equidigital number, since it uses as much as digits as its factorization.

220421824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492032 (or 492022 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 220421824 is about 14846.6098487163. The cubic root of 220421824 is about 604.0666563865.

Adding to 220421824 its reverse (428124022), we get a palindrome (648545846).

The spelling of 220421824 in words is "two hundred twenty million, four hundred twenty-one thousand, eight hundred twenty-four".