21344341311 has 24 divisors (see below), whose sum is σ = 30934424976. Its totient is φ = 14181782400.

The previous prime is 21344341307. The next prime is 21344341321. The reversal of 21344341311 is 11314344312.

21344341311 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 4 + 341 + 311 = 666.

It is not a de Polignac number, because 21344341311 - 2² = 21344341307 is a prime.

It is a super-2 number, since 2×21344341311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344341321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3529056 + ... + 3535098.

It is an arithmetic number, because the mean of its divisors is an integer number (1288934374).

Almost surely, 2^21344341311 is an apocalyptic number.

21344341311 is a deficient number, since it is larger than the sum of its proper divisors (9590083665).

21344341311 is a wasteful number, since it uses less digits than its factorization.

21344341311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7303 (or 7300 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 21344341311 its reverse (11314344312), we get a palindrome (32658685623).

The spelling of 21344341311 in words is "twenty-one billion, three hundred forty-four million, three hundred forty-one thousand, three hundred eleven".