21002304241 has 4 divisors (see below), whose sum is σ = 21018726400. Its totient is φ = 20985882084.

The previous prime is 21002304221. The next prime is 21002304259. The reversal of 21002304241 is 14240320012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002304241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002304221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8209161 + ... + 8211718.

It is an arithmetic number, because the mean of its divisors is an integer number (5254681600).

Almost surely, 2^21002304241 is an apocalyptic number.

It is an amenable number.

21002304241 is a deficient number, since it is larger than the sum of its proper divisors (16422159).

21002304241 is a wasteful number, since it uses less digits than its factorization.

21002304241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16422158.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21002304241 its reverse (14240320012), we get a palindrome (35242624253).

The spelling of 21002304241 in words is "twenty-one billion, two million, three hundred four thousand, two hundred forty-one".