424440021 has 8 divisors (see below), whose sum is σ = 572279040. Its totient is φ = 279780512.

The previous prime is 424440017. The next prime is 424440043. The reversal of 424440021 is 120044424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 424440021 - 2² = 424440017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 424440021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424440001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794565 + ... + 795098.

It is an arithmetic number, because the mean of its divisors is an integer number (71534880).

Almost surely, 2^424440021 is an apocalyptic number.

It is an amenable number.

424440021 is a deficient number, since it is larger than the sum of its proper divisors (147839019).

424440021 is a wasteful number, since it uses less digits than its factorization.

424440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589755.

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

The square root of 424440021 is about 20601.9421657280. The cubic root of 424440021 is about 751.5169422243.

Adding to 424440021 its reverse (120044424), we get a palindrome (544484445).

The spelling of 424440021 in words is "four hundred twenty-four million, four hundred forty thousand, twenty-one".