421415321 has 2 divisors, whose sum is σ = 421415322. Its totient is φ = 421415320.

The previous prime is 421415303. The next prime is 421415339. The reversal of 421415321 is 123514124.

It is a balanced prime because it is at equal distance from previous prime (421415303) and next prime (421415339).

It can be written as a sum of positive squares in only one way, i.e., 250747225 + 170668096 = 15835^2 + 13064^2 .

It is a cyclic number.

It is not a de Polignac number, because 421415321 - 2⁶ = 421415257 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (421415021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210707660 + 210707661.

It is an arithmetic number, because the mean of its divisors is an integer number (210707661).

Almost surely, 2^421415321 is an apocalyptic number.

It is an amenable number.

421415321 is a deficient number, since it is larger than the sum of its proper divisors (1).

421415321 is an equidigital number, since it uses as much as digits as its factorization.

421415321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 421415321 is about 20528.4027873578. The cubic root of 421415321 is about 749.7274986323.

Adding to 421415321 its reverse (123514124), we get a palindrome (544929445).

The spelling of 421415321 in words is "four hundred twenty-one million, four hundred fifteen thousand, three hundred twenty-one".