21210110033209 has 2 divisors, whose sum is σ = 21210110033210. Its totient is φ = 21210110033208.

The previous prime is 21210110033201. The next prime is 21210110033237. The reversal of 21210110033209 is 90233001101212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13464202809600 + 7745907223609 = 3669360^2 + 2783147^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210110033209 - 2³ = 21210110033201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210110033201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605055016604 + 10605055016605.

It is an arithmetic number, because the mean of its divisors is an integer number (10605055016605).

Almost surely, 2^{21210110033209} is an apocalyptic number.

It is an amenable number.

21210110033209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210110033209 is an equidigital number, since it uses as much as digits as its factorization.

21210110033209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21210110033209 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, thirty-three thousand, two hundred nine".