21012301171 has 2 divisors, whose sum is σ = 21012301172. Its totient is φ = 21012301170.

The previous prime is 21012301159. The next prime is 21012301213. The reversal of 21012301171 is 17110321012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012301171 - 2¹³ = 21012292979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012301151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506150585 + 10506150586.

It is an arithmetic number, because the mean of its divisors is an integer number (10506150586).

Almost surely, 2^21012301171 is an apocalyptic number.

21012301171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012301171 is an equidigital number, since it uses as much as digits as its factorization.

21012301171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 19.

Adding to 21012301171 its reverse (17110321012), we get a palindrome (38122622183).

The spelling of 21012301171 in words is "twenty-one billion, twelve million, three hundred one thousand, one hundred seventy-one".