21212210200009 has 2 divisors, whose sum is σ = 21212210200010. Its totient is φ = 21212210200008.

The previous prime is 21212210199997. The next prime is 21212210200037. The reversal of 21212210200009 is 90000201221212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14499074295225 + 6713135904784 = 3807765^2 + 2590972^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212210200009 - 2⁵ = 21212210199977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212210200039) 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, 10606105100004 + 10606105100005.

It is an arithmetic number, because the mean of its divisors is an integer number (10606105100005).

Almost surely, 2^{21212210200009} is an apocalyptic number.

It is an amenable number.

21212210200009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212210200009 is an equidigital number, since it uses as much as digits as its factorization.

21212210200009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21212210200009 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, two hundred thousand, nine".