421329 has 4 divisors (see below), whose sum is σ = 561776. Its totient is φ = 280884.

The previous prime is 421313. The next prime is 421331. The reversal of 421329 is 923124.

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 not a de Polignac number, because 421329 - 2⁴ = 421313 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70219 + ... + 70224.

It is an arithmetic number, because the mean of its divisors is an integer number (140444).

2⁴²¹³²⁹ is an apocalyptic number.

It is an amenable number.

421329 is a deficient number, since it is larger than the sum of its proper divisors (140447).

421329 is a wasteful number, since it uses less digits than its factorization.

421329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140446.

The product of its digits is 432, while the sum is 21.

The square root of 421329 is about 649.0986057603. The cubic root of 421329 is about 74.9676304760.

The spelling of 421329 in words is "four hundred twenty-one thousand, three hundred twenty-nine".