21110110939 has 2 divisors, whose sum is σ = 21110110940. Its totient is φ = 21110110938.

The previous prime is 21110110913. The next prime is 21110111003. The reversal of 21110110939 is 93901101112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21110110939 - 2⁷ = 21110110811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110110139) 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, 10555055469 + 10555055470.

It is an arithmetic number, because the mean of its divisors is an integer number (10555055470).

Almost surely, 2^21110110939 is an apocalyptic number.

21110110939 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110110939 is an equidigital number, since it uses as much as digits as its factorization.

21110110939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 28.

The spelling of 21110110939 in words is "twenty-one billion, one hundred ten million, one hundred ten thousand, nine hundred thirty-nine".