21044042441 has 8 divisors (see below), whose sum is σ = 21968733120. Its totient is φ = 20120162832.

The previous prime is 21044042431. The next prime is 21044042447. The reversal of 21044042441 is 14424044012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21044042441 - 2¹⁸ = 21043780297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21044042441.

It is not an unprimeable number, because it can be changed into a prime (21044042447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149435 + ... + 253808.

It is an arithmetic number, because the mean of its divisors is an integer number (2746091640).

Almost surely, 2^21044042441 is an apocalyptic number.

It is an amenable number.

21044042441 is a deficient number, since it is larger than the sum of its proper divisors (924690679).

21044042441 is a wasteful number, since it uses less digits than its factorization.

21044042441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405535.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21044042441 its reverse (14424044012), we get a palindrome (35468086453).

The spelling of 21044042441 in words is "twenty-one billion, forty-four million, forty-two thousand, four hundred forty-one".