421334321 has 4 divisors (see below), whose sum is σ = 424409892. Its totient is φ = 418258752.

The previous prime is 421334279. The next prime is 421334323. The reversal of 421334321 is 123433124.

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 359633296 + 61701025 = 18964^2 + 7855^2 .

It is a cyclic number.

It is not a de Polignac number, because 421334321 - 2¹⁴ = 421317937 is a prime.

It is a super-2 number, since 2×421334321² = 355045220105062082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421334323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537580 + ... + 1537853.

It is an arithmetic number, because the mean of its divisors is an integer number (106102473).

Almost surely, 2^421334321 is an apocalyptic number.

It is an amenable number.

421334321 is a deficient number, since it is larger than the sum of its proper divisors (3075571).

421334321 is a wasteful number, since it uses less digits than its factorization.

421334321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075570.

The product of its digits is 1728, while the sum is 23.

The square root of 421334321 is about 20526.4298162150. The cubic root of 421334321 is about 749.6794606552.

Adding to 421334321 its reverse (123433124), we get a palindrome (544767445).

The spelling of 421334321 in words is "four hundred twenty-one million, three hundred thirty-four thousand, three hundred twenty-one".