21110111107 has 2 divisors, whose sum is σ = 21110111108. Its totient is φ = 21110111106.

The previous prime is 21110111083. The next prime is 21110111111. The reversal of 21110111107 is 70111101112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110111107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110111167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555055553 + 10555055554.

It is an arithmetic number, because the mean of its divisors is an integer number (10555055554).

Almost surely, 2^21110111107 is an apocalyptic number.

21110111107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110111107 is an equidigital number, since it uses as much as digits as its factorization.

21110111107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14, while the sum is 16.

Adding to 21110111107 its reverse (70111101112), we get a palindrome (91221212219).

The spelling of 21110111107 in words is "twenty-one billion, one hundred ten million, one hundred eleven thousand, one hundred seven".