1220222220209 has 2 divisors, whose sum is σ = 1220222220210. Its totient is φ = 1220222220208.

The previous prime is 1220222220197. The next prime is 1220222220263. The reversal of 1220222220209 is 9020222220221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1065323301025 + 154898919184 = 1032145^2 + 393572^2 .

It is an emirp because it is prime and its reverse (9020222220221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220222220209 - 2²⁰ = 1220221171633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220222220289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610111110104 + 610111110105.

It is an arithmetic number, because the mean of its divisors is an integer number (610111110105).

Almost surely, 2^{1220222220209} is an apocalyptic number.

It is an amenable number.

1220222220209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220222220209 is an equidigital number, since it uses as much as digits as its factorization.

1220222220209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 1220222220209 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred twenty thousand, two hundred nine".