21250641460171 has 2 divisors, whose sum is σ = 21250641460172. Its totient is φ = 21250641460170.

The previous prime is 21250641460109. The next prime is 21250641460193. The reversal of 21250641460171 is 17106414605212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250641460171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21250641460271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625320730085 + 10625320730086.

It is an arithmetic number, because the mean of its divisors is an integer number (10625320730086).

Almost surely, 2^{21250641460171} is an apocalyptic number.

21250641460171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250641460171 is an equidigital number, since it uses as much as digits as its factorization.

21250641460171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21250641460171 in words is "twenty-one trillion, two hundred fifty billion, six hundred forty-one million, four hundred sixty thousand, one hundred seventy-one".