21423303271 has 2 divisors, whose sum is σ = 21423303272. Its totient is φ = 21423303270.

The previous prime is 21423303217. The next prime is 21423303281. The reversal of 21423303271 is 17230332412.

Together with previous prime (21423303217) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423303271 - 2⁹ = 21423302759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423303281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711651635 + 10711651636.

It is an arithmetic number, because the mean of its divisors is an integer number (10711651636).

Almost surely, 2^21423303271 is an apocalyptic number.

21423303271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423303271 is an equidigital number, since it uses as much as digits as its factorization.

21423303271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 28.

Adding to 21423303271 its reverse (17230332412), we get a palindrome (38653635683).

The spelling of 21423303271 in words is "twenty-one billion, four hundred twenty-three million, three hundred three thousand, two hundred seventy-one".