21043112011 has 2 divisors, whose sum is σ = 21043112012. Its totient is φ = 21043112010.

The previous prime is 21043111987. The next prime is 21043112039. The reversal of 21043112011 is 11021134012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21043112011 - 2⁹ = 21043111499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21043112711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521556005 + 10521556006.

It is an arithmetic number, because the mean of its divisors is an integer number (10521556006).

Almost surely, 2^21043112011 is an apocalyptic number.

21043112011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043112011 is an equidigital number, since it uses as much as digits as its factorization.

21043112011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21043112011 its reverse (11021134012), we get a palindrome (32064246023).

The spelling of 21043112011 in words is "twenty-one billion, forty-three million, one hundred twelve thousand, eleven".