421344020 has 12 divisors (see below), whose sum is σ = 884822484. Its totient is φ = 168537600.

The previous prime is 421344013. The next prime is 421344089. The reversal of 421344020 is 20443124.

It can be written as a sum of positive squares in 2 ways, for example, as 273770116 + 147573904 = 16546^2 + 12148^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 21067201 = 421344020 / (4 + 2 + 1 + 3 + 4 + 4 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 421343983 and 421344001.

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, 10533581 + ... + 10533620.

It is an arithmetic number, because the mean of its divisors is an integer number (73735207).

Almost surely, 2^421344020 is an apocalyptic number.

It is an amenable number.

421344020 is an abundant number, since it is smaller than the sum of its proper divisors (463478464).

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

421344020 is a wasteful number, since it uses less digits than its factorization.

421344020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21067210 (or 21067208 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421344020 is about 20526.6660712352. Note that the first 3 decimals coincide. The cubic root of 421344020 is about 749.6852130826.

Adding to 421344020 its reverse (20443124), we get a palindrome (441787144).

The spelling of 421344020 in words is "four hundred twenty-one million, three hundred forty-four thousand, twenty".