21113131244 has 24 divisors (see below), whose sum is σ = 38559628800. Its totient is φ = 10096218704.

The previous prime is 21113131229. The next prime is 21113131289. The reversal of 21113131244 is 44213131112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1107707 + ... + 1126605.

It is an arithmetic number, because the mean of its divisors is an integer number (1606651200).

Almost surely, 2^21113131244 is an apocalyptic number.

It is an amenable number.

21113131244 is a deficient number, since it is larger than the sum of its proper divisors (17446497556).

21113131244 is a wasteful number, since it uses less digits than its factorization.

21113131244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31069 (or 31067 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

Adding to 21113131244 its reverse (44213131112), we get a palindrome (65326262356).

The spelling of 21113131244 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-one thousand, two hundred forty-four".