421321 has 4 divisors (see below), whose sum is σ = 434944. Its totient is φ = 407700.

The previous prime is 421313. The next prime is 421331. The reversal of 421321 is 123124.

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 421321 - 2³ = 421313 is a prime.

It is a super-2 number, since 2×421321² = 355022770082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421331) 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, 6765 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (108736).

2⁴²¹³²¹ is an apocalyptic number.

It is an amenable number.

421321 is a deficient number, since it is larger than the sum of its proper divisors (13623).

421321 is a wasteful number, since it uses less digits than its factorization.

421321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13622.

The product of its digits is 48, while the sum is 13.

The square root of 421321 is about 649.0924433392. The cubic root of 421321 is about 74.9671559894.

Adding to 421321 its reverse (123124), we get a palindrome (544445).

The spelling of 421321 in words is "four hundred twenty-one thousand, three hundred twenty-one", and thus it is an iban number.