21110312011 has 2 divisors, whose sum is σ = 21110312012. Its totient is φ = 21110312010.

The previous prime is 21110311967. The next prime is 21110312023. The reversal of 21110312011 is 11021301112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21110312011 - 2⁹ = 21110311499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110311982 and 21110312000.

It is not a weakly prime, because it can be changed into another prime (21110312081) 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, 10555156005 + 10555156006.

It is an arithmetic number, because the mean of its divisors is an integer number (10555156006).

Almost surely, 2^21110312011 is an apocalyptic number.

21110312011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110312011 is an equidigital number, since it uses as much as digits as its factorization.

21110312011 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 13.

Adding to 21110312011 its reverse (11021301112), we get a palindrome (32131613123).

The spelling of 21110312011 in words is "twenty-one billion, one hundred ten million, three hundred twelve thousand, eleven".