102221209 has 2 divisors, whose sum is σ = 102221210. Its totient is φ = 102221208.

The previous prime is 102221183. The next prime is 102221213. The reversal of 102221209 is 902122201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79210000 + 23011209 = 8900^2 + 4797^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221209 - 2²⁵ = 68666777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102221239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110604 + 51110605.

It is an arithmetic number, because the mean of its divisors is an integer number (51110605).

Almost surely, 2^102221209 is an apocalyptic number.

It is an amenable number.

102221209 is a deficient number, since it is larger than the sum of its proper divisors (1).

102221209 is an equidigital number, since it uses as much as digits as its factorization.

102221209 is an evil number, because the sum of its binary digits is even.

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

The square root of 102221209 is about 10110.4504845234. The cubic root of 102221209 is about 467.5703940440.

The spelling of 102221209 in words is "one hundred two million, two hundred twenty-one thousand, two hundred nine".