16731537021 has 24 divisors (see below), whose sum is σ = 24746207616. Its totient is φ = 10890442080.

The previous prime is 16731536999. The next prime is 16731537061. The reversal of 16731537021 is 12073513761.

It is not a de Polignac number, because 16731537021 - 2²³ = 16723148413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16731537061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61290 + ... + 192923.

It is an arithmetic number, because the mean of its divisors is an integer number (1031091984).

Almost surely, 2^16731537021 is an apocalyptic number.

It is an amenable number.

16731537021 is a deficient number, since it is larger than the sum of its proper divisors (8014670595).

16731537021 is a wasteful number, since it uses less digits than its factorization.

16731537021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254393 (or 254390 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The spelling of 16731537021 in words is "sixteen billion, seven hundred thirty-one million, five hundred thirty-seven thousand, twenty-one".