21344444012 has 48 divisors (see below), whose sum is σ = 39637592064. Its totient is φ = 10042704000.

The previous prime is 21344444003. The next prime is 21344444047. The reversal of 21344444012 is 21044444312.

It is a super-2 number, since 2×21344444012² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 626087 + ... + 659297.

It is an arithmetic number, because the mean of its divisors is an integer number (825783168).

Almost surely, 2^21344444012 is an apocalyptic number.

It is an amenable number.

21344444012 is a deficient number, since it is larger than the sum of its proper divisors (18293148052).

21344444012 is a wasteful number, since it uses less digits than its factorization.

21344444012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33390 (or 33388 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21344444012 its reverse (21044444312), we get a palindrome (42388888324).

The spelling of 21344444012 in words is "twenty-one billion, three hundred forty-four million, four hundred forty-four thousand, twelve".