21330320111 has 2 divisors, whose sum is σ = 21330320112. Its totient is φ = 21330320110.

The previous prime is 21330320107. The next prime is 21330320117. The reversal of 21330320111 is 11102303312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21330320111 - 2² = 21330320107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21330320111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330320117) 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, 10665160055 + 10665160056.

It is an arithmetic number, because the mean of its divisors is an integer number (10665160056).

Almost surely, 2^21330320111 is an apocalyptic number.

21330320111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330320111 is an equidigital number, since it uses as much as digits as its factorization.

21330320111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21330320111 its reverse (11102303312), we get a palindrome (32432623423).

The spelling of 21330320111 in words is "twenty-one billion, three hundred thirty million, three hundred twenty thousand, one hundred eleven".