421043424 has 96 divisors (see below), whose sum is σ = 1146247200. Its totient is φ = 135217152.

The previous prime is 421043407. The next prime is 421043429. The reversal of 421043424 is 424340124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 421043394 and 421043403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421043429) 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, 400852 + ... + 401900.

It is an arithmetic number, because the mean of its divisors is an integer number (11940075).

Almost surely, 2^421043424 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 421043424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573123600).

421043424 is an abundant number, since it is smaller than the sum of its proper divisors (725203776).

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

421043424 is a wasteful number, since it uses less digits than its factorization.

421043424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1204 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 421043424 is about 20519.3426795305. The cubic root of 421043424 is about 749.5068900834.

Adding to 421043424 its reverse (424340124), we get a palindrome (845383548).

The spelling of 421043424 in words is "four hundred twenty-one million, forty-three thousand, four hundred twenty-four".