12211221109 has 2 divisors, whose sum is σ = 12211221110. Its totient is φ = 12211221108.

The previous prime is 12211221049. The next prime is 12211221151. The reversal of 12211221109 is 90112211221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11293312900 + 917908209 = 106270^2 + 30297^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211221109 - 2⁹ = 12211220597 is a prime.

It is a super-2 number, since 2×12211221109² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12211221109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211221409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105610554 + 6105610555.

It is an arithmetic number, because the mean of its divisors is an integer number (6105610555).

Almost surely, 2^12211221109 is an apocalyptic number.

It is an amenable number.

12211221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211221109 is an equidigital number, since it uses as much as digits as its factorization.

12211221109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 12211221109 in words is "twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred nine".