21252929422717 has 2 divisors, whose sum is σ = 21252929422718. Its totient is φ = 21252929422716.

The previous prime is 21252929422667. The next prime is 21252929422841. The reversal of 21252929422717 is 71722492925212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20279764929636 + 973164493081 = 4503306^2 + 986491^2 .

It is a cyclic number.

It is not a de Polignac number, because 21252929422717 - 2¹⁹ = 21252928898429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21252929402717) 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, 10626464711358 + 10626464711359.

It is an arithmetic number, because the mean of its divisors is an integer number (10626464711359).

Almost surely, 2^{21252929422717} is an apocalyptic number.

It is an amenable number.

21252929422717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252929422717 is an equidigital number, since it uses as much as digits as its factorization.

21252929422717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 55.

The spelling of 21252929422717 in words is "twenty-one trillion, two hundred fifty-two billion, nine hundred twenty-nine million, four hundred twenty-two thousand, seven hundred seventeen".