424434421 has 4 divisors (see below), whose sum is σ = 428636844. Its totient is φ = 420232000.

The previous prime is 424434389. The next prime is 424434443. The reversal of 424434421 is 124434424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173211921 + 251222500 = 13161^2 + 15850^2 .

It is a cyclic number.

It is not a de Polignac number, because 424434421 - 2⁵ = 424434389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 424434421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424434721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101060 + ... + 2101261.

It is an arithmetic number, because the mean of its divisors is an integer number (107159211).

Almost surely, 2^424434421 is an apocalyptic number.

It is an amenable number.

424434421 is a deficient number, since it is larger than the sum of its proper divisors (4202423).

424434421 is a wasteful number, since it uses less digits than its factorization.

424434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202422.

The product of its digits is 12288, while the sum is 28.

The square root of 424434421 is about 20601.8062557631. The cubic root of 424434421 is about 751.5136370746.

Adding to 424434421 its reverse (124434424), we get a palindrome (548868845).

It can be divided in two parts, 42443 and 4421, that added together give a palindrome (46864).

The spelling of 424434421 in words is "four hundred twenty-four million, four hundred thirty-four thousand, four hundred twenty-one".