21111056044 has 12 divisors (see below), whose sum is σ = 39786221104. Its totient is φ = 9743564304.

The previous prime is 21111056011. The next prime is 21111056051. The reversal of 21111056044 is 44065011112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202990872 + ... + 202990975.

Almost surely, 2^21111056044 is an apocalyptic number.

It is an amenable number.

21111056044 is a deficient number, since it is larger than the sum of its proper divisors (18675165060).

21111056044 is a wasteful number, since it uses less digits than its factorization.

21111056044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405981864 (or 405981862 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21111056044 its reverse (44065011112), we get a palindrome (65176067156).

The spelling of 21111056044 in words is "twenty-one billion, one hundred eleven million, fifty-six thousand, forty-four".