21204434041 has 8 divisors (see below), whose sum is σ = 24254343104. Its totient is φ = 18159701040.

The previous prime is 21204434021. The next prime is 21204434057. The reversal of 21204434041 is 14043440212.

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 21204434041 - 2¹³ = 21204425849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21204433997 and 21204434015.

It is not an unprimeable number, because it can be changed into a prime (21204434021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1285230 + ... + 1301623.

It is an arithmetic number, because the mean of its divisors is an integer number (3031792888).

Almost surely, 2^21204434041 is an apocalyptic number.

It is an amenable number.

21204434041 is a deficient number, since it is larger than the sum of its proper divisors (3049909063).

21204434041 is a wasteful number, since it uses less digits than its factorization.

21204434041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588031.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21204434041 its reverse (14043440212), we get a palindrome (35247874253).

The spelling of 21204434041 in words is "twenty-one billion, two hundred four million, four hundred thirty-four thousand, forty-one".