21105131104 has 48 divisors (see below), whose sum is σ = 42437712240. Its totient is φ = 10329638400.

The previous prime is 21105131059. The next prime is 21105131137. The reversal of 21105131104 is 40113150112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253054 + ... + 325954.

It is an arithmetic number, because the mean of its divisors is an integer number (884119005).

Almost surely, 2^21105131104 is an apocalyptic number.

It is an amenable number.

21105131104 is an abundant number, since it is smaller than the sum of its proper divisors (21332581136).

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

21105131104 is a wasteful number, since it uses less digits than its factorization.

21105131104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73103 (or 73095 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21105131104 its reverse (40113150112), we get a palindrome (61218281216).

The spelling of 21105131104 in words is "twenty-one billion, one hundred five million, one hundred thirty-one thousand, one hundred four".