21243312244 has 36 divisors (see below), whose sum is σ = 46700181472. Its totient is φ = 8276613840.

The previous prime is 21243312131. The next prime is 21243312263. The reversal of 21243312244 is 44221334212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 3131694 + ... + 3138469.

Almost surely, 2^21243312244 is an apocalyptic number.

It is an amenable number.

21243312244 is an abundant number, since it is smaller than the sum of its proper divisors (25456869228).

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

21243312244 is a wasteful number, since it uses less digits than its factorization.

21243312244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270196 (or 6270183 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

Adding to 21243312244 its reverse (44221334212), we get a palindrome (65464646456).

The spelling of 21243312244 in words is "twenty-one billion, two hundred forty-three million, three hundred twelve thousand, two hundred forty-four".