421031321 has 4 divisors (see below), whose sum is σ = 425762100. Its totient is φ = 416300544.

The previous prime is 421031267. The next prime is 421031339. The reversal of 421031321 is 123130124.

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 301369600 + 119661721 = 17360^2 + 10939^2 .

It is a cyclic number.

It is not a de Polignac number, because 421031321 - 2¹⁸ = 420769177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 421031321.

It is not an unprimeable number, because it can be changed into a prime (421031371) 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, 2365256 + ... + 2365433.

It is an arithmetic number, because the mean of its divisors is an integer number (106440525).

Almost surely, 2^421031321 is an apocalyptic number.

It is an amenable number.

421031321 is a deficient number, since it is larger than the sum of its proper divisors (4730779).

421031321 is an equidigital number, since it uses as much as digits as its factorization.

421031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4730778.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 421031321 is about 20519.0477605565. The cubic root of 421031321 is about 749.4997084261.

Adding to 421031321 its reverse (123130124), we get a palindrome (544161445).

The spelling of 421031321 in words is "four hundred twenty-one million, thirty-one thousand, three hundred twenty-one".