16189897321 has 48 divisors (see below), whose sum is σ = 18770346000. Its totient is φ = 13960297728.

The previous prime is 16189897319. The next prime is 16189897349. The reversal of 16189897321 is 12379898161.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 13521038400 + 2668858921 = 116280^2 + 51661^2 .

It is not a de Polignac number, because 16189897321 - 2¹ = 16189897319 is a prime.

It is a super-2 number, since 2×16189897321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16189897721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108656955 + ... + 108657103.

It is an arithmetic number, because the mean of its divisors is an integer number (391048875).

Almost surely, 2^16189897321 is an apocalyptic number.

It is an amenable number.

16189897321 is a deficient number, since it is larger than the sum of its proper divisors (2580448679).

16189897321 is a wasteful number, since it uses less digits than its factorization.

16189897321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 318 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 55.

The spelling of 16189897321 in words is "sixteen billion, one hundred eighty-nine million, eight hundred ninety-seven thousand, three hundred twenty-one".