221122122209 has 2 divisors, whose sum is σ = 221122122210. Its totient is φ = 221122122208.

The previous prime is 221122122187. The next prime is 221122122229. The reversal of 221122122209 is 902221221122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151264989184 + 69857133025 = 388928^2 + 264305^2 .

It is a cyclic number.

It is not a de Polignac number, because 221122122209 - 2²⁰ = 221121073633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221122122229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561061104 + 110561061105.

It is an arithmetic number, because the mean of its divisors is an integer number (110561061105).

Almost surely, 2^221122122209 is an apocalyptic number.

It is an amenable number.

221122122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

221122122209 is an equidigital number, since it uses as much as digits as its factorization.

221122122209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 221122122209 in words is "two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred nine".