421310321 has 2 divisors, whose sum is σ = 421310322. Its totient is φ = 421310320.

The previous prime is 421310293. The next prime is 421310333. The reversal of 421310321 is 123013124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320589025 + 100721296 = 17905^2 + 10036^2 .

It is a cyclic number.

It is not a de Polignac number, because 421310321 - 2¹⁰ = 421309297 is a prime.

It is a super-2 number, since 2×421310321² = 355004773162246082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 421310321.

It is not a weakly prime, because it can be changed into another prime (421310381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210655160 + 210655161.

It is an arithmetic number, because the mean of its divisors is an integer number (210655161).

Almost surely, 2^421310321 is an apocalyptic number.

It is an amenable number.

421310321 is a deficient number, since it is larger than the sum of its proper divisors (1).

421310321 is an equidigital number, since it uses as much as digits as its factorization.

421310321 is an evil number, because the sum of its binary digits is even.

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

The square root of 421310321 is about 20525.8451957526. The cubic root of 421310321 is about 749.6652259981.

Adding to 421310321 its reverse (123013124), we get a palindrome (544323445).

It can be divided in two parts, 4213103 and 21, that added together give a palindrome (4213124).

The spelling of 421310321 in words is "four hundred twenty-one million, three hundred ten thousand, three hundred twenty-one".