21489828168269 has 2 divisors, whose sum is σ = 21489828168270. Its totient is φ = 21489828168268.

The previous prime is 21489828168241. The next prime is 21489828168271. The reversal of 21489828168269 is 96286182898412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17644452280900 + 3845375887369 = 4200530^2 + 1960963^2 .

It is a cyclic number.

It is not a de Polignac number, because 21489828168269 - 2²⁴ = 21489811391053 is a prime.

It is a super-2 number, since 2×21489828168269² (a number of 27 digits) contains 22 as substring.

Together with 21489828168271, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21489828168196 and 21489828168205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21489828168209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10744914084134 + 10744914084135.

It is an arithmetic number, because the mean of its divisors is an integer number (10744914084135).

Almost surely, 2^{21489828168269} is an apocalyptic number.

It is an amenable number.

21489828168269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21489828168269 is an equidigital number, since it uses as much as digits as its factorization.

21489828168269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 382205952, while the sum is 74.

The spelling of 21489828168269 in words is "twenty-one trillion, four hundred eighty-nine billion, eight hundred twenty-eight million, one hundred sixty-eight thousand, two hundred sixty-nine".