21321023003171 has 2 divisors, whose sum is σ = 21321023003172. Its totient is φ = 21321023003170.

The previous prime is 21321023003083. The next prime is 21321023003179. The reversal of 21321023003171 is 17130032012312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321023003171 - 2³⁴ = 21303843133987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21321023003171.

It is not a weakly prime, because it can be changed into another prime (21321023003179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660511501585 + 10660511501586.

It is an arithmetic number, because the mean of its divisors is an integer number (10660511501586).

Almost surely, 2^{21321023003171} is an apocalyptic number.

21321023003171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321023003171 is an equidigital number, since it uses as much as digits as its factorization.

21321023003171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 21321023003171 its reverse (17130032012312), we get a palindrome (38451055015483).

The spelling of 21321023003171 in words is "twenty-one trillion, three hundred twenty-one billion, twenty-three million, three thousand, one hundred seventy-one".