1221022220209 has 12 divisors (see below), whose sum is σ = 1359104145280. Its totient is φ = 1095969303000.

The previous prime is 1221022220161. The next prime is 1221022220261. The reversal of 1221022220209 is 9020222201221.

It is not a de Polignac number, because 1221022220209 - 2²⁵ = 1220988665777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221022226209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63858117 + ... + 63877234.

Almost surely, 2^{1221022220209} is an apocalyptic number.

It is an amenable number.

1221022220209 is a deficient number, since it is larger than the sum of its proper divisors (138081925071).

1221022220209 is a wasteful number, since it uses less digits than its factorization.

1221022220209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127735452 (or 127735441 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 1221022220209 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty thousand, two hundred nine".