21240304301 has 4 divisors (see below), whose sum is σ = 21241670592. Its totient is φ = 21238938012.

The previous prime is 21240304279. The next prime is 21240304303. The reversal of 21240304301 is 10340304212.

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-21240304301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240304303) 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, 659555 + ... + 691008.

It is an arithmetic number, because the mean of its divisors is an integer number (5310417648).

Almost surely, 2^21240304301 is an apocalyptic number.

It is an amenable number.

21240304301 is a deficient number, since it is larger than the sum of its proper divisors (1366291).

21240304301 is a wasteful number, since it uses less digits than its factorization.

21240304301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366290.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21240304301 its reverse (10340304212), we get a palindrome (31580608513).

The spelling of 21240304301 in words is "twenty-one billion, two hundred forty million, three hundred four thousand, three hundred one".