16921586889 has 27 divisors (see below), whose sum is σ = 24704935437. Its totient is φ = 11161121400.

The previous prime is 16921586881. The next prime is 16921586947. The reversal of 16921586889 is 98868512961.

The square root of 16921586889 is 130083.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 16921586889 - 2³ = 16921586881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16921586881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 51122454 + ... + 51122784.

Almost surely, 2^16921586889 is an apocalyptic number.

16921586889 is the 130083-rd square number.

16921586889 is the 65042-nd centered octagonal number.

It is an amenable number.

16921586889 is a deficient number, since it is larger than the sum of its proper divisors (7783348548).

16921586889 is an frugal number, since it uses more digits than its factorization.

16921586889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 465 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 63.

The spelling of 16921586889 in words is "sixteen billion, nine hundred twenty-one million, five hundred eighty-six thousand, eight hundred eighty-nine".