21530001104 has 20 divisors (see below), whose sum is σ = 41774766720. Its totient is φ = 10749416160.

The previous prime is 21530001091. The next prime is 21530001109. The reversal of 21530001104 is 40110003512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530001109) 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, 962624 + ... + 984735.

It is an arithmetic number, because the mean of its divisors is an integer number (2088738336).

Almost surely, 2^21530001104 is an apocalyptic number.

It is an amenable number.

21530001104 is a deficient number, since it is larger than the sum of its proper divisors (20244765616).

21530001104 is a wasteful number, since it uses less digits than its factorization.

21530001104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948058 (or 1948052 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21530001104 its reverse (40110003512), we get a palindrome (61640004616).

The spelling of 21530001104 in words is "twenty-one billion, five hundred thirty million, one thousand, one hundred four".