21212323271 has 2 divisors, whose sum is σ = 21212323272. Its totient is φ = 21212323270.

The previous prime is 21212323243. The next prime is 21212323333. The reversal of 21212323271 is 17232321212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212323271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21212323271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212323571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606161635 + 10606161636.

It is an arithmetic number, because the mean of its divisors is an integer number (10606161636).

Almost surely, 2^21212323271 is an apocalyptic number.

21212323271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212323271 is an equidigital number, since it uses as much as digits as its factorization.

21212323271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

Adding to 21212323271 its reverse (17232321212), we get a palindrome (38444644483).

The spelling of 21212323271 in words is "twenty-one billion, two hundred twelve million, three hundred twenty-three thousand, two hundred seventy-one".