21112321423 has 2 divisors, whose sum is σ = 21112321424. Its totient is φ = 21112321422.

The previous prime is 21112321421. The next prime is 21112321457. The reversal of 21112321423 is 32412321112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112321423 - 2¹ = 21112321421 is a prime.

Together with 21112321421, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21112321394 and 21112321403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112321421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556160711 + 10556160712.

It is an arithmetic number, because the mean of its divisors is an integer number (10556160712).

Almost surely, 2^21112321423 is an apocalyptic number.

21112321423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112321423 is an equidigital number, since it uses as much as digits as its factorization.

21112321423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

Adding to 21112321423 its reverse (32412321112), we get a palindrome (53524642535).

The spelling of 21112321423 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-one thousand, four hundred twenty-three".