421304020 has 12 divisors (see below), whose sum is σ = 884738484. Its totient is φ = 168521600.

The previous prime is 421304011. The next prime is 421304021. The reversal of 421304020 is 20403124.

It can be written as a sum of positive squares in 2 ways, for example, as 82228624 + 339075396 = 9068^2 + 18414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421303985 and 421304003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421304021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10532581 + ... + 10532620.

It is an arithmetic number, because the mean of its divisors is an integer number (73728207).

Almost surely, 2^421304020 is an apocalyptic number.

It is an amenable number.

421304020 is an abundant number, since it is smaller than the sum of its proper divisors (463434464).

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

421304020 is a wasteful number, since it uses less digits than its factorization.

421304020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21065210 (or 21065208 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 421304020 is about 20525.6917057623. The cubic root of 421304020 is about 749.6614887180.

Adding to 421304020 its reverse (20403124), we get a palindrome (441707144).

The spelling of 421304020 in words is "four hundred twenty-one million, three hundred four thousand, twenty".