21222044344 has 16 divisors (see below), whose sum is σ = 39803393520. Its totient is φ = 10607806080.

The previous prime is 21222044339. The next prime is 21222044369. The reversal of 21222044344 is 44344022212.

It is a super-2 number, since 2×21222044344² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 373852 + ... + 426859.

It is an arithmetic number, because the mean of its divisors is an integer number (2487712095).

Almost surely, 2^21222044344 is an apocalyptic number.

It is an amenable number.

21222044344 is a deficient number, since it is larger than the sum of its proper divisors (18581349176).

21222044344 is a wasteful number, since it uses less digits than its factorization.

21222044344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804030 (or 804026 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21222044344 its reverse (44344022212), we get a palindrome (65566066556).

The spelling of 21222044344 in words is "twenty-one billion, two hundred twenty-two million, forty-four thousand, three hundred forty-four".