21089357171 has 2 divisors, whose sum is σ = 21089357172. Its totient is φ = 21089357170.

The previous prime is 21089357137. The next prime is 21089357189. The reversal of 21089357171 is 17175398012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21089357171 is a prime.

It is a super-3 number, since 3×21089357171³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21089357111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10544678585 + 10544678586.

It is an arithmetic number, because the mean of its divisors is an integer number (10544678586).

Almost surely, 2^21089357171 is an apocalyptic number.

21089357171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21089357171 is an equidigital number, since it uses as much as digits as its factorization.

21089357171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 21089357171 in words is "twenty-one billion, eighty-nine million, three hundred fifty-seven thousand, one hundred seventy-one".