16721723 has 2 divisors, whose sum is σ = 16721724. Its totient is φ = 16721722.

The previous prime is 16721701. The next prime is 16721737. The reversal of 16721723 is 32712761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16721723 - 2¹⁰ = 16720699 is a prime.

It is not a weakly prime, because it can be changed into another prime (16721773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360861 + 8360862.

It is an arithmetic number, because the mean of its divisors is an integer number (8360862).

Almost surely, 2^16721723 is an apocalyptic number.

16721723 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721723 is an equidigital number, since it uses as much as digits as its factorization.

16721723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 29.

The square root of 16721723 is about 4089.2203413365. The cubic root of 16721723 is about 255.7174362370.

The spelling of 16721723 in words is "sixteen million, seven hundred twenty-one thousand, seven hundred twenty-three".