21243032244 has 96 divisors (see below), whose sum is σ = 66644847360. Its totient is φ = 5712408576.

The previous prime is 21243032233. The next prime is 21243032249. The reversal of 21243032244 is 44223034212.

21243032244 is a `hidden beast` number, since 2 + 1 + 2 + 430 + 3 + 224 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243032249) by changing a digit.

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, 813597 + ... + 839300.

It is an arithmetic number, because the mean of its divisors is an integer number (694217160).

Almost surely, 2^21243032244 is an apocalyptic number.

It is an amenable number.

21243032244 is an abundant number, since it is smaller than the sum of its proper divisors (45401815116).

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

21243032244 is a wasteful number, since it uses less digits than its factorization.

21243032244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652934 (or 1652926 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21243032244 its reverse (44223034212), we get a palindrome (65466066456).

The spelling of 21243032244 in words is "twenty-one billion, two hundred forty-three million, thirty-two thousand, two hundred forty-four".