21212010011 has 2 divisors, whose sum is σ = 21212010012. Its totient is φ = 21212010010.

The previous prime is 21212009993. The next prime is 21212010013. The reversal of 21212010011 is 11001021212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212010011 is a prime.

Together with 21212010013, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212009974 and 21212010001.

It is not a weakly prime, because it can be changed into another prime (21212010013) 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, 10606005005 + 10606005006.

It is an arithmetic number, because the mean of its divisors is an integer number (10606005006).

Almost surely, 2^21212010011 is an apocalyptic number.

21212010011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212010011 is an equidigital number, since it uses as much as digits as its factorization.

21212010011 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 21212010011 its reverse (11001021212), we get a palindrome (32213031223).

The spelling of 21212010011 in words is "twenty-one billion, two hundred twelve million, ten thousand, eleven".