1220210209 has 2 divisors, whose sum is σ = 1220210210. Its totient is φ = 1220210208.

The previous prime is 1220210171. The next prime is 1220210227. The reversal of 1220210209 is 9020120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1219965184 + 245025 = 34928^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220210209 - 2¹¹ = 1220208161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220210279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105104 + 610105105.

It is an arithmetic number, because the mean of its divisors is an integer number (610105105).

Almost surely, 2^1220210209 is an apocalyptic number.

It is an amenable number.

1220210209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220210209 is an equidigital number, since it uses as much as digits as its factorization.

1220210209 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 square root of 1220210209 is about 34931.5073966183. The cubic root of 1220210209 is about 1068.5910967245.

The spelling of 1220210209 in words is "one billion, two hundred twenty million, two hundred ten thousand, two hundred nine".