21500104554204 has 12 divisors (see below), whose sum is σ = 50166910626504. Its totient is φ = 7166701518064.

The previous prime is 21500104554193. The next prime is 21500104554209. The reversal of 21500104554204 is 40245540100512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500104554209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895837689747 + ... + 895837689770.

It is an arithmetic number, because the mean of its divisors is an integer number (4180575885542).

Almost surely, 2^{21500104554204} is an apocalyptic number.

It is an amenable number.

21500104554204 is an abundant number, since it is smaller than the sum of its proper divisors (28666806072300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21500104554204 is a wasteful number, since it uses less digits than its factorization.

21500104554204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791675379524 (or 1791675379522 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 21500104554204 its reverse (40245540100512), we get a palindrome (61745644654716).

The spelling of 21500104554204 in words is "twenty-one trillion, five hundred billion, one hundred four million, five hundred fifty-four thousand, two hundred four".