21308140873529 has 2 divisors, whose sum is σ = 21308140873530. Its totient is φ = 21308140873528.

The previous prime is 21308140873519. The next prime is 21308140873531. The reversal of 21308140873529 is 92537804180312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21204873765625 + 103267107904 = 4604875^2 + 321352^2 .

It is a cyclic number.

It is not a de Polignac number, because 21308140873529 - 2²⁰ = 21308139824953 is a prime.

Together with 21308140873531, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21308140873519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10654070436764 + 10654070436765.

It is an arithmetic number, because the mean of its divisors is an integer number (10654070436765).

Almost surely, 2^{21308140873529} is an apocalyptic number.

It is an amenable number.

21308140873529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21308140873529 is an equidigital number, since it uses as much as digits as its factorization.

21308140873529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 21308140873529 in words is "twenty-one trillion, three hundred eight billion, one hundred forty million, eight hundred seventy-three thousand, five hundred twenty-nine".