21000104240535 has 24 divisors (see below), whose sum is σ = 41600206496160. Its totient is φ = 9600047652672.

The previous prime is 21000104240509. The next prime is 21000104240539. The reversal of 21000104240535 is 53504240100012.

21000104240535 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 0 + 104 + 24 + 0 + 535 = 666.

It is not a de Polignac number, because 21000104240535 - 2¹² = 21000104236439 is a prime.

It is a super-2 number, since 2×21000104240535² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000104240499 and 21000104240508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000104240539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33333498480 + ... + 33333499109.

It is an arithmetic number, because the mean of its divisors is an integer number (1733341937340).

Almost surely, 2^{21000104240535} is an apocalyptic number.

21000104240535 is a deficient number, since it is larger than the sum of its proper divisors (20600102255625).

21000104240535 is a wasteful number, since it uses less digits than its factorization.

21000104240535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66666997607 (or 66666997604 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21000104240535 its reverse (53504240100012), we get a palindrome (74504344340547).

The spelling of 21000104240535 in words is "twenty-one trillion, one hundred four million, two hundred forty thousand, five hundred thirty-five".