423436421 has 2 divisors, whose sum is σ = 423436422. Its totient is φ = 423436420.

The previous prime is 423436393. The next prime is 423436423. The reversal of 423436421 is 124634324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238857025 + 184579396 = 15455^2 + 13586^2 .

It is a cyclic number.

It is not a de Polignac number, because 423436421 - 2¹⁸ = 423174277 is a prime.

Together with 423436423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423436423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211718210 + 211718211.

It is an arithmetic number, because the mean of its divisors is an integer number (211718211).

Almost surely, 2^423436421 is an apocalyptic number.

It is an amenable number.

423436421 is a deficient number, since it is larger than the sum of its proper divisors (1).

423436421 is an equidigital number, since it uses as much as digits as its factorization.

423436421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 29.

The square root of 423436421 is about 20577.5708235933. The cubic root of 423436421 is about 750.9241473198.

The spelling of 423436421 in words is "four hundred twenty-three million, four hundred thirty-six thousand, four hundred twenty-one".