21212212212211 has 2 divisors, whose sum is σ = 21212212212212. Its totient is φ = 21212212212210.

The previous prime is 21212212212203. The next prime is 21212212212239. The reversal of 21212212212211 is 11221221221212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212212212211 - 2³ = 21212212212203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212212212011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606106106105 + 10606106106106.

It is an arithmetic number, because the mean of its divisors is an integer number (10606106106106).

Almost surely, 2^{21212212212211} is an apocalyptic number.

21212212212211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212212212211 is an equidigital number, since it uses as much as digits as its factorization.

21212212212211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 22.

Adding to 21212212212211 its reverse (11221221221212), we get a palindrome (32433433433423).

Subtracting from 21212212212211 its reverse (11221221221212), we obtain a palindrome (9990990990999).

The spelling of 21212212212211 in words is "twenty-one trillion, two hundred twelve billion, two hundred twelve million, two hundred twelve thousand, two hundred eleven".