21204404234041 has 16 divisors (see below), whose sum is σ = 24279898364928. Its totient is φ = 18140502214800.

The previous prime is 21204404234029. The next prime is 21204404234081. The reversal of 21204404234041 is 14043240440212.

It is a happy number.

It is not a de Polignac number, because 21204404234041 - 2¹⁵ = 21204404201273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21204404233994 and 21204404234012.

It is not an unprimeable number, because it can be changed into a prime (21204404234081) 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 15 ways as a sum of consecutive naturals, for example, 12839046 + ... + 14396176.

It is an arithmetic number, because the mean of its divisors is an integer number (1517493647808).

Almost surely, 2^{21204404234041} is an apocalyptic number.

It is an amenable number.

21204404234041 is a deficient number, since it is larger than the sum of its proper divisors (3075494130887).

21204404234041 is a wasteful number, since it uses less digits than its factorization.

21204404234041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560852.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 21204404234041 its reverse (14043240440212), we get a palindrome (35247644674253).

The spelling of 21204404234041 in words is "twenty-one trillion, two hundred four billion, four hundred four million, two hundred thirty-four thousand, forty-one".