21464501171 has 2 divisors, whose sum is σ = 21464501172. Its totient is φ = 21464501170.

The previous prime is 21464501159. The next prime is 21464501197. The reversal of 21464501171 is 17110546412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21464501171 - 2²² = 21460306867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21464501131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732250585 + 10732250586.

It is an arithmetic number, because the mean of its divisors is an integer number (10732250586).

Almost surely, 2^21464501171 is an apocalyptic number.

21464501171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464501171 is an equidigital number, since it uses as much as digits as its factorization.

21464501171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 21464501171 in words is "twenty-one billion, four hundred sixty-four million, five hundred one thousand, one hundred seventy-one".