21042242044 has 6 divisors (see below), whose sum is σ = 36823923584. Its totient is φ = 10521121020.

The previous prime is 21042242029. The next prime is 21042242057. The reversal of 21042242044 is 44024224012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630280252 + ... + 2630280259.

Almost surely, 2^21042242044 is an apocalyptic number.

It is an amenable number.

21042242044 is a deficient number, since it is larger than the sum of its proper divisors (15781681540).

21042242044 is a wasteful number, since it uses less digits than its factorization.

21042242044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5260560515 (or 5260560513 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21042242044 its reverse (44024224012), we get a palindrome (65066466056).

The spelling of 21042242044 in words is "twenty-one billion, forty-two million, two hundred forty-two thousand, forty-four".