21110012044 has 24 divisors (see below), whose sum is σ = 40304678400. Its totient is φ = 9594568080.

The previous prime is 21110012041. The next prime is 21110012057. The reversal of 21110012044 is 44021001112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21110012041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 783997 + ... + 810475.

It is an arithmetic number, because the mean of its divisors is an integer number (1679361600).

Almost surely, 2^21110012044 is an apocalyptic number.

It is an amenable number.

21110012044 is a deficient number, since it is larger than the sum of its proper divisors (19194666356).

21110012044 is a wasteful number, since it uses less digits than its factorization.

21110012044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44613 (or 44611 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21110012044 its reverse (44021001112), we get a palindrome (65131013156).

The spelling of 21110012044 in words is "twenty-one billion, one hundred ten million, twelve thousand, forty-four".