421523204 has 24 divisors (see below), whose sum is σ = 753979968. Its totient is φ = 206125920.

The previous prime is 421523191. The next prime is 421523239. The reversal of 421523204 is 402325124.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 421523204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67169 + ... + 73175.

It is an arithmetic number, because the mean of its divisors is an integer number (31415832).

Almost surely, 2^421523204 is an apocalyptic number.

It is an amenable number.

421523204 is a deficient number, since it is larger than the sum of its proper divisors (332456764).

421523204 is a wasteful number, since it uses less digits than its factorization.

421523204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6395 (or 6393 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 421523204 is about 20531.0302712747. The cubic root of 421523204 is about 749.7914703222.

Adding to 421523204 its product of nonzero digits (1920), we get a palindrome (421525124).

Adding to 421523204 its reverse (402325124), we get a palindrome (823848328).

The spelling of 421523204 in words is "four hundred twenty-one million, five hundred twenty-three thousand, two hundred four".