434243021 has 4 divisors (see below), whose sum is σ = 434558844. Its totient is φ = 433927200.

The previous prime is 434242999. The next prime is 434243039. The reversal of 434243021 is 120342434.

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 346146025 + 88096996 = 18605^2 + 9386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-434243021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (434243521) 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, 155840 + ... + 158601.

It is an arithmetic number, because the mean of its divisors is an integer number (108639711).

Almost surely, 2^434243021 is an apocalyptic number.

It is an amenable number.

434243021 is a deficient number, since it is larger than the sum of its proper divisors (315823).

434243021 is a wasteful number, since it uses less digits than its factorization.

434243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315822.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 434243021 is about 20838.4985303644. The cubic root of 434243021 is about 757.2587189880.

Adding to 434243021 its reverse (120342434), we get a palindrome (554585455).

The spelling of 434243021 in words is "four hundred thirty-four million, two hundred forty-three thousand, twenty-one".