21489828168271 has 2 divisors, whose sum is σ = 21489828168272. Its totient is φ = 21489828168270.

The previous prime is 21489828168269. The next prime is 21489828168313. The reversal of 21489828168271 is 17286182898412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21489828168271 - 2¹ = 21489828168269 is a prime.

It is a super-2 number, since 2×21489828168271² (a number of 27 digits) contains 22 as substring.

Together with 21489828168269, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21489828168197 and 21489828168206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21489828168241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10744914084135 + 10744914084136.

It is an arithmetic number, because the mean of its divisors is an integer number (10744914084136).

Almost surely, 2^{21489828168271} is an apocalyptic number.

21489828168271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21489828168271 is an equidigital number, since it uses as much as digits as its factorization.

21489828168271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49545216, while the sum is 67.

The spelling of 21489828168271 in words is "twenty-one trillion, four hundred eighty-nine billion, eight hundred twenty-eight million, one hundred sixty-eight thousand, two hundred seventy-one".