21112044644 has 24 divisors (see below), whose sum is σ = 37288043520. Its totient is φ = 10458546336.

The previous prime is 21112044623. The next prime is 21112044661. The reversal of 21112044644 is 44644021112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347294 + ... + 403530.

It is an arithmetic number, because the mean of its divisors is an integer number (1553668480).

Almost surely, 2^21112044644 is an apocalyptic number.

It is an amenable number.

21112044644 is a deficient number, since it is larger than the sum of its proper divisors (16175998876).

21112044644 is a wasteful number, since it uses less digits than its factorization.

21112044644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57107 (or 57105 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 21112044644 its reverse (44644021112), we get a palindrome (65756065756).

The spelling of 21112044644 in words is "twenty-one billion, one hundred twelve million, forty-four thousand, six hundred forty-four".