21344440411 has 4 divisors (see below), whose sum is σ = 24393646192. Its totient is φ = 18295234632.

The previous prime is 21344440409. The next prime is 21344440417. The reversal of 21344440411 is 11404444312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21344440411 - 2¹ = 21344440409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21344440411.

It is not an unprimeable number, because it can be changed into a prime (21344440417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1524602880 + ... + 1524602893.

It is an arithmetic number, because the mean of its divisors is an integer number (6098411548).

Almost surely, 2^21344440411 is an apocalyptic number.

21344440411 is a deficient number, since it is larger than the sum of its proper divisors (3049205781).

21344440411 is an equidigital number, since it uses as much as digits as its factorization.

21344440411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049205780.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21344440411 its reverse (11404444312), we get a palindrome (32748884723).

The spelling of 21344440411 in words is "twenty-one billion, three hundred forty-four million, four hundred forty thousand, four hundred eleven".