21344240341 has 4 divisors (see below), whose sum is σ = 21385052032. Its totient is φ = 21303428652.

The previous prime is 21344240339. The next prime is 21344240347. The reversal of 21344240341 is 14304244312.

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 not a de Polignac number, because 21344240341 - 2¹ = 21344240339 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 (21344240347) 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, 20405061 + ... + 20406106.

It is an arithmetic number, because the mean of its divisors is an integer number (5346263008).

Almost surely, 2^21344240341 is an apocalyptic number.

It is an amenable number.

21344240341 is a deficient number, since it is larger than the sum of its proper divisors (40811691).

21344240341 is an equidigital number, since it uses as much as digits as its factorization.

21344240341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40811690.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21344240341 its reverse (14304244312), we get a palindrome (35648484653).

The spelling of 21344240341 in words is "twenty-one billion, three hundred forty-four million, two hundred forty thousand, three hundred forty-one".