21010201100209 has 2 divisors, whose sum is σ = 21010201100210. Its totient is φ = 21010201100208.

The previous prime is 21010201100117. The next prime is 21010201100249. The reversal of 21010201100209 is 90200110201012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12732479427600 + 8277721672609 = 3568260^2 + 2877103^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010201100209 - 2¹³ = 21010201092017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010201100249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505100550104 + 10505100550105.

It is an arithmetic number, because the mean of its divisors is an integer number (10505100550105).

Almost surely, 2^{21010201100209} is an apocalyptic number.

It is an amenable number.

21010201100209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010201100209 is an equidigital number, since it uses as much as digits as its factorization.

21010201100209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21010201100209 in words is "twenty-one trillion, ten billion, two hundred one million, one hundred thousand, two hundred nine".