21344044313 has 4 divisors (see below), whose sum is σ = 21344790288. Its totient is φ = 21343298340.

The previous prime is 21344044277. The next prime is 21344044333. The reversal of 21344044313 is 31344044312.

It is a happy number.

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 21344044313 - 2¹⁸ = 21343782169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344044333) 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, 328283 + ... + 387888.

It is an arithmetic number, because the mean of its divisors is an integer number (5336197572).

Almost surely, 2^21344044313 is an apocalyptic number.

It is an amenable number.

21344044313 is a deficient number, since it is larger than the sum of its proper divisors (745975).

21344044313 is an equidigital number, since it uses as much as digits as its factorization.

21344044313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745974.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21344044313 its reverse (31344044312), we get a palindrome (52688088625).

Subtracting 21344044313 from its reverse (31344044312), we obtain a palindrome (9999999999).

The spelling of 21344044313 in words is "twenty-one billion, three hundred forty-four million, forty-four thousand, three hundred thirteen".