21331023271 has 2 divisors, whose sum is σ = 21331023272. Its totient is φ = 21331023270.

The previous prime is 21331023209. The next prime is 21331023277. The reversal of 21331023271 is 17232013312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21331023271 - 2¹⁷ = 21330892199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331023277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665511635 + 10665511636.

It is an arithmetic number, because the mean of its divisors is an integer number (10665511636).

Almost surely, 2^21331023271 is an apocalyptic number.

21331023271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331023271 is an equidigital number, since it uses as much as digits as its factorization.

21331023271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21331023271 its reverse (17232013312), we get a palindrome (38563036583).

The spelling of 21331023271 in words is "twenty-one billion, three hundred thirty-one million, twenty-three thousand, two hundred seventy-one".