21033312011 has 2 divisors, whose sum is σ = 21033312012. Its totient is φ = 21033312010.

The previous prime is 21033311993. The next prime is 21033312023. The reversal of 21033312011 is 11021333012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033312011 - 2²⁶ = 20966203147 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21033312071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516656005 + 10516656006.

It is an arithmetic number, because the mean of its divisors is an integer number (10516656006).

Almost surely, 2^21033312011 is an apocalyptic number.

21033312011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033312011 is an equidigital number, since it uses as much as digits as its factorization.

21033312011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21033312011 its reverse (11021333012), we get a palindrome (32054645023).

The spelling of 21033312011 in words is "twenty-one billion, thirty-three million, three hundred twelve thousand, eleven".