21344323207 has 2 divisors, whose sum is σ = 21344323208. Its totient is φ = 21344323206.

The previous prime is 21344323181. The next prime is 21344323213. The reversal of 21344323207 is 70232344312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344323207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21344324207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672161603 + 10672161604.

It is an arithmetic number, because the mean of its divisors is an integer number (10672161604).

Almost surely, 2^21344323207 is an apocalyptic number.

21344323207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344323207 is an equidigital number, since it uses as much as digits as its factorization.

21344323207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 31.

Adding to 21344323207 its reverse (70232344312), we get a palindrome (91576667519).

The spelling of 21344323207 in words is "twenty-one billion, three hundred forty-four million, three hundred twenty-three thousand, two hundred seven".