21105310702271 has 2 divisors, whose sum is σ = 21105310702272. Its totient is φ = 21105310702270.

The previous prime is 21105310702261. The next prime is 21105310702309. The reversal of 21105310702271 is 17220701350112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21105310702271 - 2¹⁰ = 21105310701247 is a prime.

It is a super-2 number, since 2×21105310702271² (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 (21105310702241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552655351135 + 10552655351136.

It is an arithmetic number, because the mean of its divisors is an integer number (10552655351136).

Almost surely, 2^{21105310702271} is an apocalyptic number.

21105310702271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21105310702271 is an equidigital number, since it uses as much as digits as its factorization.

21105310702271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 32.

The spelling of 21105310702271 in words is "twenty-one trillion, one hundred five billion, three hundred ten million, seven hundred two thousand, two hundred seventy-one".