21212211202099 has 2 divisors, whose sum is σ = 21212211202100. Its totient is φ = 21212211202098.

The previous prime is 21212211202073. The next prime is 21212211202111. The reversal of 21212211202099 is 99020211221212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212211202099 - 2⁷ = 21212211201971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212211202019) 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, 10606105601049 + 10606105601050.

It is an arithmetic number, because the mean of its divisors is an integer number (10606105601050).

Almost surely, 2^{21212211202099} is an apocalyptic number.

21212211202099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212211202099 is an equidigital number, since it uses as much as digits as its factorization.

21212211202099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 21212211202099 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, two hundred two thousand, ninety-nine".