21212211012011 has 2 divisors, whose sum is σ = 21212211012012. Its totient is φ = 21212211012010.

The previous prime is 21212211011989. The next prime is 21212211012029. The reversal of 21212211012011 is 11021011221212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212211012011 - 2⁶ = 21212211011947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212211012061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606105506005 + 10606105506006.

It is an arithmetic number, because the mean of its divisors is an integer number (10606105506006).

Almost surely, 2^{21212211012011} is an apocalyptic number.

21212211012011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212211012011 is an equidigital number, since it uses as much as digits as its factorization.

21212211012011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21212211012011 its reverse (11021011221212), we get a palindrome (32233222233223).

The spelling of 21212211012011 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, twelve thousand, eleven".