421311321 has 8 divisors (see below), whose sum is σ = 624164960. Its totient is φ = 280874196.

The previous prime is 421311313. The next prime is 421311329. The reversal of 421311321 is 123113124.

It is an interprime number because it is at equal distance from previous prime (421311313) and next prime (421311329).

It is not a de Polignac number, because 421311321 - 2³ = 421311313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421311294 and 421311303.

It is not an unprimeable number, because it can be changed into a prime (421311329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7802035 + ... + 7802088.

It is an arithmetic number, because the mean of its divisors is an integer number (78020620).

Almost surely, 2^421311321 is an apocalyptic number.

It is an amenable number.

421311321 is a deficient number, since it is larger than the sum of its proper divisors (202853639).

421311321 is a wasteful number, since it uses less digits than its factorization.

421311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15604132 (or 15604126 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 421311321 is about 20525.8695552710. The cubic root of 421311321 is about 749.6658191196.

Adding to 421311321 its reverse (123113124), we get a palindrome (544424445).

The spelling of 421311321 in words is "four hundred twenty-one million, three hundred eleven thousand, three hundred twenty-one".