21210210011 has 2 divisors, whose sum is σ = 21210210012. Its totient is φ = 21210210010.

The previous prime is 21210209983. The next prime is 21210210031. The reversal of 21210210011 is 11001201212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210210011 - 2³⁴ = 4030340827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210209974 and 21210210001.

It is not a weakly prime, because it can be changed into another prime (21210210031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605105005 + 10605105006.

It is an arithmetic number, because the mean of its divisors is an integer number (10605105006).

Almost surely, 2^21210210011 is an apocalyptic number.

21210210011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210210011 is an equidigital number, since it uses as much as digits as its factorization.

21210210011 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 21210210011 its reverse (11001201212), we get a palindrome (32211411223).

The spelling of 21210210011 in words is "twenty-one billion, two hundred ten million, two hundred ten thousand, eleven".