21159383604489 has 81 divisors (see below), whose sum is σ = 33542145018837. Its totient is φ = 12847723267392.

The previous prime is 21159383604487. The next prime is 21159383604503. The reversal of 21159383604489 is 98440638395112.

The square root of 21159383604489 is 4599933.

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

21159383604489 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 93 + 8 + 3 + 60 + 4 + 489 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19618764489 + 21139764840000 = 140067^2 + 4597800^2 .

It is not a de Polignac number, because 21159383604489 - 2¹ = 21159383604487 is a prime.

It is a super-2 number, since 2×21159383604489² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21159383604487) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 14172392827 + ... + 14172394319.

Almost surely, 2^{21159383604489} is an apocalyptic number.

21159383604489 is the 4599933-rd square number.

21159383604489 is the 2299967-th centered octagonal number.

It is an amenable number.

21159383604489 is a deficient number, since it is larger than the sum of its proper divisors (12382761414348).

21159383604489 is an frugal number, since it uses more digits than its factorization.

21159383604489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 21159383604489 in words is "twenty-one trillion, one hundred fifty-nine billion, three hundred eighty-three million, six hundred four thousand, four hundred eighty-nine".