21104234553 has 8 divisors (see below), whose sum is σ = 29619978400. Its totient is φ = 13328990208.

The previous prime is 21104234539. The next prime is 21104234573. The reversal of 21104234553 is 35543240112.

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

It is not a de Polignac number, because 21104234553 - 2¹⁰ = 21104233529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21104234553.

It is not an unprimeable number, because it can be changed into a prime (21104234513) 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, 185124808 + ... + 185124921.

It is an arithmetic number, because the mean of its divisors is an integer number (3702497300).

Almost surely, 2^21104234553 is an apocalyptic number.

It is an amenable number.

21104234553 is a deficient number, since it is larger than the sum of its proper divisors (8515743847).

21104234553 is a wasteful number, since it uses less digits than its factorization.

21104234553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370249751.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21104234553 its reverse (35543240112), we get a palindrome (56647474665).

The spelling of 21104234553 in words is "twenty-one billion, one hundred four million, two hundred thirty-four thousand, five hundred fifty-three".