202102121121209 has 2 divisors, whose sum is σ = 202102121121210. Its totient is φ = 202102121121208.

The previous prime is 202102121121193. The next prime is 202102121121343. The reversal of 202102121121209 is 902121121201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171223505857600 + 30878615263609 = 13085240^2 + 5556853^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102121121209 - 2⁴ = 202102121121193 is a prime.

It is not a weakly prime, because it can be changed into another prime (202102121121809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101051060560604 + 101051060560605.

It is an arithmetic number, because the mean of its divisors is an integer number (101051060560605).

Almost surely, 2^{202102121121209} is an apocalyptic number.

It is an amenable number.

202102121121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

202102121121209 is an equidigital number, since it uses as much as digits as its factorization.

202102121121209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 202102121121209 in words is "two hundred two trillion, one hundred two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred nine".