421004424 has 16 divisors (see below), whose sum is σ = 1052511120. Its totient is φ = 140334800.

The previous prime is 421004399. The next prime is 421004431. The reversal of 421004424 is 424400124.

It is a self number, because there is not a number n which added to its sum of digits gives 421004424.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8770902 + ... + 8770949.

It is an arithmetic number, because the mean of its divisors is an integer number (65781945).

Almost surely, 2^421004424 is an apocalyptic number.

It is an amenable number.

421004424 is an abundant number, since it is smaller than the sum of its proper divisors (631506696).

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

421004424 is a wasteful number, since it uses less digits than its factorization.

421004424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17541860 (or 17541856 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 421004424 is about 20518.3923346835. The cubic root of 421004424 is about 749.4837478376.

Adding to 421004424 its reverse (424400124), we get a palindrome (845404548).

The spelling of 421004424 in words is "four hundred twenty-one million, four thousand, four hundred twenty-four".