16721502271 has 2 divisors, whose sum is σ = 16721502272. Its totient is φ = 16721502270.

The previous prime is 16721502247. The next prime is 16721502293. The reversal of 16721502271 is 17220512761.

It is a strong prime.

It is an emirp because it is prime and its reverse (17220512761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16721502271 - 2⁹ = 16721501759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16721502571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360751135 + 8360751136.

It is an arithmetic number, because the mean of its divisors is an integer number (8360751136).

Almost surely, 2^16721502271 is an apocalyptic number.

16721502271 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721502271 is an equidigital number, since it uses as much as digits as its factorization.

16721502271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 16721502271 in words is "sixteen billion, seven hundred twenty-one million, five hundred two thousand, two hundred seventy-one".