421216423 has 2 divisors, whose sum is σ = 421216424. Its totient is φ = 421216422.

The previous prime is 421216409. The next prime is 421216459. The reversal of 421216423 is 324612124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421216423 - 2⁵ = 421216391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421216723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210608211 + 210608212.

It is an arithmetic number, because the mean of its divisors is an integer number (210608212).

Almost surely, 2^421216423 is an apocalyptic number.

421216423 is a deficient number, since it is larger than the sum of its proper divisors (1).

421216423 is an equidigital number, since it uses as much as digits as its factorization.

421216423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 25.

The square root of 421216423 is about 20523.5577568803. The cubic root of 421216423 is about 749.6095288932.

Adding to 421216423 its reverse (324612124), we get a palindrome (745828547).

The spelling of 421216423 in words is "four hundred twenty-one million, two hundred sixteen thousand, four hundred twenty-three".