21344113423 has 2 divisors, whose sum is σ = 21344113424. Its totient is φ = 21344113422.

The previous prime is 21344113393. The next prime is 21344113451. The reversal of 21344113423 is 32431144312.

It is a happy number.

It is an a-pointer prime, because the next prime (21344113451) can be obtained adding 21344113423 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344113423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21344113391 and 21344113400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21344113463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672056711 + 10672056712.

It is an arithmetic number, because the mean of its divisors is an integer number (10672056712).

Almost surely, 2^21344113423 is an apocalyptic number.

21344113423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344113423 is an equidigital number, since it uses as much as digits as its factorization.

21344113423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

Adding to 21344113423 its reverse (32431144312), we get a palindrome (53775257735).

The spelling of 21344113423 in words is "twenty-one billion, three hundred forty-four million, one hundred thirteen thousand, four hundred twenty-three".