21013304241 has 16 divisors (see below), whose sum is σ = 28514534400. Its totient is φ = 13760837328.

The previous prime is 21013304237. The next prime is 21013304357. The reversal of 21013304241 is 14240331012.

It is not a de Polignac number, because 21013304241 - 2² = 21013304237 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21013304441) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 188460 + ... + 278466.

It is an arithmetic number, because the mean of its divisors is an integer number (1782158400).

Almost surely, 2^21013304241 is an apocalyptic number.

It is an amenable number.

21013304241 is a deficient number, since it is larger than the sum of its proper divisors (7501230159).

21013304241 is a wasteful number, since it uses less digits than its factorization.

21013304241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91388.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21013304241 its reverse (14240331012), we get a palindrome (35253635253).

The spelling of 21013304241 in words is "twenty-one billion, thirteen million, three hundred four thousand, two hundred forty-one".