21231132244 has 96 divisors (see below), whose sum is σ = 46053100800. Its totient is φ = 8358100992.

The previous prime is 21231132173. The next prime is 21231132269. The reversal of 21231132244 is 44223113212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3367407 + ... + 3373705.

It is an arithmetic number, because the mean of its divisors is an integer number (479719800).

Almost surely, 2^21231132244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231132244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23026550400).

21231132244 is an abundant number, since it is smaller than the sum of its proper divisors (24821968556).

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

21231132244 is a wasteful number, since it uses less digits than its factorization.

21231132244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497 (or 6495 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 21231132244 its reverse (44223113212), we get a palindrome (65454245456).

The spelling of 21231132244 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, two hundred forty-four".