21345324111 has 12 divisors (see below), whose sum is σ = 31895312280. Its totient is φ = 13739518800.

The previous prime is 21345324097. The next prime is 21345324113. The reversal of 21345324111 is 11142354312.

21345324111 is a `hidden beast` number, since 2 + 13 + 4 + 532 + 4 + 111 = 666.

It is not a de Polignac number, because 21345324111 - 2⁵ = 21345324079 is a prime.

It is a super-2 number, since 2×21345324111² (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 (21345324113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40891165 + ... + 40891686.

It is an arithmetic number, because the mean of its divisors is an integer number (2657942690).

Almost surely, 2^21345324111 is an apocalyptic number.

21345324111 is a deficient number, since it is larger than the sum of its proper divisors (10549988169).

21345324111 is a wasteful number, since it uses less digits than its factorization.

21345324111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81782886 (or 81782883 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 21345324111 its reverse (11142354312), we get a palindrome (32487678423).

The spelling of 21345324111 in words is "twenty-one billion, three hundred forty-five million, three hundred twenty-four thousand, one hundred eleven".