202102209 has 20 divisors (see below), whose sum is σ = 308335104. Its totient is φ = 131865624.

The previous prime is 202102207. The next prime is 202102223. The reversal of 202102209 is 902201202.

It is not a de Polignac number, because 202102209 - 2¹ = 202102207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202102191 and 202102200.

It is not an unprimeable number, because it can be changed into a prime (202102207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22737 + ... + 30350.

Almost surely, 2^202102209 is an apocalyptic number.

It is an amenable number.

202102209 is a deficient number, since it is larger than the sum of its proper divisors (106232895).

202102209 is an equidigital number, since it uses as much as digits as its factorization.

202102209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53146 (or 53137 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 202102209 is about 14216.2656488967. The cubic root of 202102209 is about 586.8453758179.

The spelling of 202102209 in words is "two hundred two million, one hundred two thousand, two hundred nine".