421423 has 2 divisors, whose sum is σ = 421424. Its totient is φ = 421422.

The previous prime is 421417. The next prime is 421433. The reversal of 421423 is 324124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421423 - 2¹⁷ = 290351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421397 and 421406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210711 + 210712.

It is an arithmetic number, because the mean of its divisors is an integer number (210712).

2⁴²¹⁴²³ is an apocalyptic number.

421423 is a deficient number, since it is larger than the sum of its proper divisors (1).

421423 is an equidigital number, since it uses as much as digits as its factorization.

421423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 16.

The square root of 421423 is about 649.1710098271. The cubic root of 421423 is about 74.9732052432.

Adding to 421423 its reverse (324124), we get a palindrome (745547).

The spelling of 421423 in words is "four hundred twenty-one thousand, four hundred twenty-three", and thus it is an iban number.