21344423411 has 2 divisors, whose sum is σ = 21344423412. Its totient is φ = 21344423410.

The previous prime is 21344423339. The next prime is 21344423449. The reversal of 21344423411 is 11432444312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344423411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344423011) 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, 10672211705 + 10672211706.

It is an arithmetic number, because the mean of its divisors is an integer number (10672211706).

Almost surely, 2^21344423411 is an apocalyptic number.

21344423411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344423411 is an equidigital number, since it uses as much as digits as its factorization.

21344423411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 29.

Adding to 21344423411 its reverse (11432444312), we get a palindrome (32776867723).

The spelling of 21344423411 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-three thousand, four hundred eleven".