434221521 has 4 divisors (see below), whose sum is σ = 578962032. Its totient is φ = 289481012.

The previous prime is 434221519. The next prime is 434221549. The reversal of 434221521 is 125122434.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 434221521 - 2¹ = 434221519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 434221491 and 434221500.

It is not an unprimeable number, because it can be changed into a prime (434221511) 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, 72370251 + ... + 72370256.

It is an arithmetic number, because the mean of its divisors is an integer number (144740508).

Almost surely, 2^434221521 is an apocalyptic number.

It is an amenable number.

434221521 is a deficient number, since it is larger than the sum of its proper divisors (144740511).

434221521 is a wasteful number, since it uses less digits than its factorization.

434221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144740510.

The product of its digits is 1920, while the sum is 24.

The square root of 434221521 is about 20837.9826518788. The cubic root of 434221521 is about 757.2462211236.

Adding to 434221521 its reverse (125122434), we get a palindrome (559343955).

The spelling of 434221521 in words is "four hundred thirty-four million, two hundred twenty-one thousand, five hundred twenty-one".