434320021 has 4 divisors (see below), whose sum is σ = 434653632. Its totient is φ = 433986412.

The previous prime is 434320009. The next prime is 434320027. The reversal of 434320021 is 120023434.

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 434320021 - 2⁵ = 434319989 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 (434320027) 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, 164845 + ... + 167458.

It is an arithmetic number, because the mean of its divisors is an integer number (108663408).

Almost surely, 2^434320021 is an apocalyptic number.

It is an amenable number.

434320021 is a deficient number, since it is larger than the sum of its proper divisors (333611).

434320021 is a wasteful number, since it uses less digits than its factorization.

434320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333610.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 434320021 is about 20840.3459904100. The cubic root of 434320021 is about 757.3034753974.

Adding to 434320021 its reverse (120023434), we get a palindrome (554343455).

The spelling of 434320021 in words is "four hundred thirty-four million, three hundred twenty thousand, twenty-one".