21320133271 has 2 divisors, whose sum is σ = 21320133272. Its totient is φ = 21320133270.

The previous prime is 21320133253. The next prime is 21320133283. The reversal of 21320133271 is 17233102312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21320133271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320133371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660066635 + 10660066636.

It is an arithmetic number, because the mean of its divisors is an integer number (10660066636).

Almost surely, 2^21320133271 is an apocalyptic number.

21320133271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320133271 is an equidigital number, since it uses as much as digits as its factorization.

21320133271 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21320133271 its reverse (17233102312), we get a palindrome (38553235583).

The spelling of 21320133271 in words is "twenty-one billion, three hundred twenty million, one hundred thirty-three thousand, two hundred seventy-one".