21000111111107 has 2 divisors, whose sum is σ = 21000111111108. Its totient is φ = 21000111111106.

The previous prime is 21000111111061. The next prime is 21000111111121. The reversal of 21000111111107 is 70111111100012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000111111107 - 2²⁴ = 21000094333891 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000111111157) 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, 10500055555553 + 10500055555554.

It is an arithmetic number, because the mean of its divisors is an integer number (10500055555554).

Almost surely, 2^{21000111111107} is an apocalyptic number.

21000111111107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000111111107 is an equidigital number, since it uses as much as digits as its factorization.

21000111111107 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 17.

Adding to 21000111111107 its reverse (70111111100012), we get a palindrome (91111222211119).

The spelling of 21000111111107 in words is "twenty-one trillion, one hundred eleven million, one hundred eleven thousand, one hundred seven".