21323112121271 has 2 divisors, whose sum is σ = 21323112121272. Its totient is φ = 21323112121270.

The previous prime is 21323112121253. The next prime is 21323112121313. The reversal of 21323112121271 is 17212121132312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21323112121271 is a prime.

It is a super-2 number, since 2×21323112121271² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323112121471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661556060635 + 10661556060636.

It is an arithmetic number, because the mean of its divisors is an integer number (10661556060636).

Almost surely, 2^{21323112121271} is an apocalyptic number.

21323112121271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323112121271 is an equidigital number, since it uses as much as digits as its factorization.

21323112121271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

Adding to 21323112121271 its reverse (17212121132312), we get a palindrome (38535233253583).

The spelling of 21323112121271 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred twelve million, one hundred twenty-one thousand, two hundred seventy-one".