21034430171 has 2 divisors, whose sum is σ = 21034430172. Its totient is φ = 21034430170.

The previous prime is 21034430161. The next prime is 21034430227. The reversal of 21034430171 is 17103443012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21034430171 - 2³⁰ = 19960688347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21034430171.

It is not a weakly prime, because it can be changed into another prime (21034430161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517215085 + 10517215086.

It is an arithmetic number, because the mean of its divisors is an integer number (10517215086).

Almost surely, 2^21034430171 is an apocalyptic number.

21034430171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034430171 is an equidigital number, since it uses as much as digits as its factorization.

21034430171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21034430171 its reverse (17103443012), we get a palindrome (38137873183).

The spelling of 21034430171 in words is "twenty-one billion, thirty-four million, four hundred thirty thousand, one hundred seventy-one".