21223434233423 has 2 divisors, whose sum is σ = 21223434233424. Its totient is φ = 21223434233422.

The previous prime is 21223434233371. The next prime is 21223434233459. The reversal of 21223434233423 is 32433243432212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21223434233423 - 2²⁰ = 21223433184847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223434233723) 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, 10611717116711 + 10611717116712.

It is an arithmetic number, because the mean of its divisors is an integer number (10611717116712).

Almost surely, 2^{21223434233423} is an apocalyptic number.

21223434233423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223434233423 is an equidigital number, since it uses as much as digits as its factorization.

21223434233423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 38.

Adding to 21223434233423 its reverse (32433243432212), we get a palindrome (53656677665635).

The spelling of 21223434233423 in words is "twenty-one trillion, two hundred twenty-three billion, four hundred thirty-four million, two hundred thirty-three thousand, four hundred twenty-three".