21044221112 has 8 divisors (see below), whose sum is σ = 39457914600. Its totient is φ = 10522110552.

The previous prime is 21044221109. The next prime is 21044221117. The reversal of 21044221112 is 21112244012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044221117) by changing a digit.

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 as a sum of consecutive naturals, namely, 1315263812 + ... + 1315263827.

It is an arithmetic number, because the mean of its divisors is an integer number (4932239325).

Almost surely, 2^21044221112 is an apocalyptic number.

It is an amenable number.

21044221112 is a deficient number, since it is larger than the sum of its proper divisors (18413693488).

21044221112 is a wasteful number, since it uses less digits than its factorization.

21044221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630527645 (or 2630527641 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21044221112 its reverse (21112244012), we get a palindrome (42156465124).

The spelling of 21044221112 in words is "twenty-one billion, forty-four million, two hundred twenty-one thousand, one hundred twelve".