21344304441 has 16 divisors (see below), whose sum is σ = 29336131328. Its totient is φ = 13793846400.

The previous prime is 21344304391. The next prime is 21344304461. The reversal of 21344304441 is 14440344312.

It is not a de Polignac number, because 21344304441 - 2²² = 21340110137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21344304399 and 21344304408.

It is not an unprimeable number, because it can be changed into a prime (21344304461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324700 + ... + 384861.

It is an arithmetic number, because the mean of its divisors is an integer number (1833508208).

Almost surely, 2^21344304441 is an apocalyptic number.

It is an amenable number.

21344304441 is a deficient number, since it is larger than the sum of its proper divisors (7991826887).

21344304441 is a wasteful number, since it uses less digits than its factorization.

21344304441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709872.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21344304441 its reverse (14440344312), we get a palindrome (35784648753).

The spelling of 21344304441 in words is "twenty-one billion, three hundred forty-four million, three hundred four thousand, four hundred forty-one".