21432334423 has 2 divisors, whose sum is σ = 21432334424. Its totient is φ = 21432334422.

The previous prime is 21432334393. The next prime is 21432334459. The reversal of 21432334423 is 32443323412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21432334423 - 2¹³ = 21432326231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21432331423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716167211 + 10716167212.

It is an arithmetic number, because the mean of its divisors is an integer number (10716167212).

Almost surely, 2^21432334423 is an apocalyptic number.

21432334423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432334423 is an equidigital number, since it uses as much as digits as its factorization.

21432334423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 31.

Adding to 21432334423 its reverse (32443323412), we get a palindrome (53875657835).

The spelling of 21432334423 in words is "twenty-one billion, four hundred thirty-two million, three hundred thirty-four thousand, four hundred twenty-three".