421243423 has 2 divisors, whose sum is σ = 421243424. Its totient is φ = 421243422.

The previous prime is 421243411. The next prime is 421243441. The reversal of 421243423 is 324342124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421243423 - 2²⁵ = 387688991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421243223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210621711 + 210621712.

It is an arithmetic number, because the mean of its divisors is an integer number (210621712).

Almost surely, 2^421243423 is an apocalyptic number.

421243423 is a deficient number, since it is larger than the sum of its proper divisors (1).

421243423 is an equidigital number, since it uses as much as digits as its factorization.

421243423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 25.

The square root of 421243423 is about 20524.2155270305. The cubic root of 421243423 is about 749.6255452241.

Adding to 421243423 its reverse (324342124), we get a palindrome (745585547).

The spelling of 421243423 in words is "four hundred twenty-one million, two hundred forty-three thousand, four hundred twenty-three".