21211200011 has 2 divisors, whose sum is σ = 21211200012. Its totient is φ = 21211200010.

The previous prime is 21211199987. The next prime is 21211200019. The reversal of 21211200011 is 11000211212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211200011 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211199965 and 21211200001.

It is not a weakly prime, because it can be changed into another prime (21211200019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605600005 + 10605600006.

It is an arithmetic number, because the mean of its divisors is an integer number (10605600006).

Almost surely, 2^21211200011 is an apocalyptic number.

21211200011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211200011 is an equidigital number, since it uses as much as digits as its factorization.

21211200011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21211200011 its reverse (11000211212), we get a palindrome (32211411223).

The spelling of 21211200011 in words is "twenty-one billion, two hundred eleven million, two hundred thousand, eleven".