421304220 has 48 divisors (see below), whose sum is σ = 1310725920. Its totient is φ = 112347648.

The previous prime is 421304207. The next prime is 421304227. The reversal of 421304220 is 22403124.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 421304193 and 421304202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421304227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389557 + ... + 390636.

It is an arithmetic number, because the mean of its divisors is an integer number (27306790).

Almost surely, 2^421304220 is an apocalyptic number.

It is an amenable number.

421304220 is an abundant number, since it is smaller than the sum of its proper divisors (889421700).

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

421304220 is a wasteful number, since it uses less digits than its factorization.

421304220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780211 (or 780203 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 421304220 is about 20525.6965777047. The cubic root of 421304220 is about 749.6616073435.

Adding to 421304220 its reverse (22403124), we get a palindrome (443707344).

The spelling of 421304220 in words is "four hundred twenty-one million, three hundred four thousand, two hundred twenty".