421820224 has 84 divisors (see below), whose sum is σ = 1005352320. Its totient is φ = 174908160.

The previous prime is 421820219. The next prime is 421820227. The reversal of 421820224 is 422028124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421820227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95047 + ... + 99385.

It is an arithmetic number, because the mean of its divisors is an integer number (11968480).

Almost surely, 2^421820224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421820224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (502676160).

421820224 is an abundant number, since it is smaller than the sum of its proper divisors (583532096).

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

421820224 is a wasteful number, since it uses less digits than its factorization.

421820224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396 (or 4379 counting only the distinct ones).

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

The square root of 421820224 is about 20538.2624386777. The cubic root of 421820224 is about 749.9675387432.

Adding to 421820224 its reverse (422028124), we get a palindrome (843848348).

It can be divided in two parts, 4218 and 20224, that added together give a palindrome (24442).

The spelling of 421820224 in words is "four hundred twenty-one million, eight hundred twenty thousand, two hundred twenty-four".