21212001010171 has 2 divisors, whose sum is σ = 21212001010172. Its totient is φ = 21212001010170.

The previous prime is 21212001010157. The next prime is 21212001010223. The reversal of 21212001010171 is 17101010021212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212001010171 - 2²¹ = 21211998913019 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212001010111) 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, 10606000505085 + 10606000505086.

It is an arithmetic number, because the mean of its divisors is an integer number (10606000505086).

Almost surely, 2^{21212001010171} is an apocalyptic number.

21212001010171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212001010171 is an equidigital number, since it uses as much as digits as its factorization.

21212001010171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 21212001010171 its reverse (17101010021212), we get a palindrome (38313011031383).

The spelling of 21212001010171 in words is "twenty-one trillion, two hundred twelve billion, one million, ten thousand, one hundred seventy-one".