21193587799839 has 48 divisors (see below), whose sum is σ = 37725365396992. Its totient is φ = 11164830364224.

The previous prime is 21193587799817. The next prime is 21193587799847. The reversal of 21193587799839 is 93899778539112.

21193587799839 is a `hidden beast` number, since 2 + 119 + 358 + 7 + 79 + 9 + 83 + 9 = 666.

It is not a de Polignac number, because 21193587799839 - 2¹⁷ = 21193587668767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21193587799849) 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, 15795979 + ... + 17085084.

Almost surely, 2^{21193587799839} is an apocalyptic number.

21193587799839 is a deficient number, since it is larger than the sum of its proper divisors (16531777597153).

21193587799839 is a wasteful number, since it uses less digits than its factorization.

21193587799839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32881876 (or 32881873 counting only the distinct ones).

The product of its digits is 1851776640, while the sum is 81.

The spelling of 21193587799839 in words is "twenty-one trillion, one hundred ninety-three billion, five hundred eighty-seven million, seven hundred ninety-nine thousand, eight hundred thirty-nine".