21163113524 has 18 divisors (see below), whose sum is σ = 43082052930. Its totient is φ = 9069905712.

The previous prime is 21163113523. The next prime is 21163113529. The reversal of 21163113524 is 42531136112.

It can be written as a sum of positive squares in only one way, i.e., 19357713424 + 1805400100 = 139132^2 + 42490^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163113523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53987339 + ... + 53987730.

It is an arithmetic number, because the mean of its divisors is an integer number (2393447385).

Almost surely, 2^21163113524 is an apocalyptic number.

It is an amenable number.

21163113524 is an abundant number, since it is smaller than the sum of its proper divisors (21918939406).

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

21163113524 is a wasteful number, since it uses less digits than its factorization.

21163113524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107975087 (or 107975078 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

Adding to 21163113524 its reverse (42531136112), we get a palindrome (63694249636).

The spelling of 21163113524 in words is "twenty-one billion, one hundred sixty-three million, one hundred thirteen thousand, five hundred twenty-four".