21113244044 has 24 divisors (see below), whose sum is σ = 39130620480. Its totient is φ = 9933353216.

The previous prime is 21113243969. The next prime is 21113244077. The reversal of 21113244044 is 44044231112.

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, 281837 + ... + 348795.

It is an arithmetic number, because the mean of its divisors is an integer number (1630442520).

Almost surely, 2^21113244044 is an apocalyptic number.

It is an amenable number.

21113244044 is a deficient number, since it is larger than the sum of its proper divisors (18017376436).

21113244044 is a wasteful number, since it uses less digits than its factorization.

21113244044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71617 (or 71615 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21113244044 its reverse (44044231112), we get a palindrome (65157475156).

The spelling of 21113244044 in words is "twenty-one billion, one hundred thirteen million, two hundred forty-four thousand, forty-four".