21111242044 has 12 divisors (see below), whose sum is σ = 36971435368. Its totient is φ = 10547974800.

The previous prime is 21111242029. The next prime is 21111242069. The reversal of 21111242044 is 44024211112.

It is a congruent number.

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, 1905342 + ... + 1916389.

Almost surely, 2^21111242044 is an apocalyptic number.

It is an amenable number.

21111242044 is a deficient number, since it is larger than the sum of its proper divisors (15860193324).

21111242044 is a wasteful number, since it uses less digits than its factorization.

21111242044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823116 (or 3823114 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21111242044 its reverse (44024211112), we get a palindrome (65135453156).

The spelling of 21111242044 in words is "twenty-one billion, one hundred eleven million, two hundred forty-two thousand, forty-four".