21113120111 has 2 divisors, whose sum is σ = 21113120112. Its totient is φ = 21113120110.

The previous prime is 21113120071. The next prime is 21113120117. The reversal of 21113120111 is 11102131112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113120111 - 2¹⁰ = 21113119087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113120117) 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 as a sum of consecutive naturals, namely, 10556560055 + 10556560056.

It is an arithmetic number, because the mean of its divisors is an integer number (10556560056).

Almost surely, 2^21113120111 is an apocalyptic number.

21113120111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113120111 is an equidigital number, since it uses as much as digits as its factorization.

21113120111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21113120111 its reverse (11102131112), we get a palindrome (32215251223).

The spelling of 21113120111 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty thousand, one hundred eleven".