1222021011209 has 6 divisors (see below), whose sum is σ = 1248574661514. Its totient is φ = 1196020562000.

The previous prime is 1222021011203. The next prime is 1222021011217. The reversal of 1222021011209 is 9021101202221.

It can be written as a sum of positive squares in only one way, i.e., 1135869955984 + 86151055225 = 1065772^2 + 293515^2 .

It is not a de Polignac number, because 1222021011209 - 2²⁸ = 1221752575753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222021011203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276598292 + ... + 276602709.

It is an arithmetic number, because the mean of its divisors is an integer number (208095776919).

Almost surely, 2^{1222021011209} is an apocalyptic number.

It is an amenable number.

1222021011209 is a deficient number, since it is larger than the sum of its proper divisors (26553650305).

1222021011209 is an frugal number, since it uses more digits than its factorization.

1222021011209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553201095 (or 553201048 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1222021011209 in words is "one trillion, two hundred twenty-two billion, twenty-one million, eleven thousand, two hundred nine".