2100200021209 has 2 divisors, whose sum is σ = 2100200021210. Its totient is φ = 2100200021208.

The previous prime is 2100200021197. The next prime is 2100200021221. The reversal of 2100200021209 is 9021200020012.

It is a balanced prime because it is at equal distance from previous prime (2100200021197) and next prime (2100200021221).

It can be written as a sum of positive squares in only one way, i.e., 2008039204809 + 92160816400 = 1417053^2 + 303580^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100200021209 - 2⁷ = 2100200021081 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100200021279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050100010604 + 1050100010605.

It is an arithmetic number, because the mean of its divisors is an integer number (1050100010605).

Almost surely, 2^{2100200021209} is an apocalyptic number.

It is an amenable number.

2100200021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100200021209 is an equidigital number, since it uses as much as digits as its factorization.

2100200021209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 2100200021209 in words is "two trillion, one hundred billion, two hundred million, twenty-one thousand, two hundred nine".