18889081321 has 8 divisors (see below), whose sum is σ = 20615484384. Its totient is φ = 17164213920.

The previous prime is 18889081313. The next prime is 18889081349. The reversal of 18889081321 is 12318098881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18889081321 - 2³ = 18889081313 is a prime.

It is a super-2 number, since 2×18889081321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18889081721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358116 + ... + 407461.

It is an arithmetic number, because the mean of its divisors is an integer number (2576935548).

Almost surely, 2^18889081321 is an apocalyptic number.

18889081321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18889081321 is a deficient number, since it is larger than the sum of its proper divisors (1726403063).

18889081321 is a wasteful number, since it uses less digits than its factorization.

18889081321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767831.

The product of its (nonzero) digits is 221184, while the sum is 49.

The spelling of 18889081321 in words is "eighteen billion, eight hundred eighty-nine million, eighty-one thousand, three hundred twenty-one".