21340320111 has 12 divisors (see below), whose sum is σ = 33627171240. Its totient is φ = 12933527280.

The previous prime is 21340320109. The next prime is 21340320121. The reversal of 21340320111 is 11102304312.

21340320111 is a `hidden beast` number, since 2 + 1 + 340 + 320 + 1 + 1 + 1 = 666.

It is not a de Polignac number, because 21340320111 - 2¹ = 21340320109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340320121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107779296 + ... + 107779493.

It is an arithmetic number, because the mean of its divisors is an integer number (2802264270).

Almost surely, 2^21340320111 is an apocalyptic number.

21340320111 is a deficient number, since it is larger than the sum of its proper divisors (12286851129).

21340320111 is a wasteful number, since it uses less digits than its factorization.

21340320111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215558806 (or 215558803 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21340320111 its reverse (11102304312), we get a palindrome (32442624423).

The spelling of 21340320111 in words is "twenty-one billion, three hundred forty million, three hundred twenty thousand, one hundred eleven".