21102320111 has 2 divisors, whose sum is σ = 21102320112. Its totient is φ = 21102320110.

The previous prime is 21102320101. The next prime is 21102320191. The reversal of 21102320111 is 11102320112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102320111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102320101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551160055 + 10551160056.

It is an arithmetic number, because the mean of its divisors is an integer number (10551160056).

Almost surely, 2^21102320111 is an apocalyptic number.

21102320111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102320111 is an equidigital number, since it uses as much as digits as its factorization.

21102320111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21102320111 its reverse (11102320112), we get a palindrome (32204640223).

Subtracting from 21102320111 its reverse (11102320112), we obtain a palindrome (9999999999).

The spelling of 21102320111 in words is "twenty-one billion, one hundred two million, three hundred twenty thousand, one hundred eleven".