16721531323 has 32 divisors (see below), whose sum is σ = 20866968576. Its totient is φ = 13087122048.

The previous prime is 16721531293. The next prime is 16721531413. The reversal of 16721531323 is 32313512761.

It is not a de Polignac number, because 16721531323 - 2²⁹ = 16184660411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16721532323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289240 + ... + 342202.

It is an arithmetic number, because the mean of its divisors is an integer number (652092768).

Almost surely, 2^16721531323 is an apocalyptic number.

16721531323 is a deficient number, since it is larger than the sum of its proper divisors (4145437253).

16721531323 is a wasteful number, since it uses less digits than its factorization.

16721531323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53083.

The product of its digits is 22680, while the sum is 34.

The spelling of 16721531323 in words is "sixteen billion, seven hundred twenty-one million, five hundred thirty-one thousand, three hundred twenty-three".