111220211209 has 2 divisors, whose sum is σ = 111220211210. Its totient is φ = 111220211208.

The previous prime is 111220211191. The next prime is 111220211227. The reversal of 111220211209 is 902112022111.

It is a balanced prime because it is at equal distance from previous prime (111220211191) and next prime (111220211227).

It can be written as a sum of positive squares in only one way, i.e., 90738307984 + 20481903225 = 301228^2 + 143115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220211209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111220211209.

It is not a weakly prime, because it can be changed into another prime (111220217209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610105604 + 55610105605.

It is an arithmetic number, because the mean of its divisors is an integer number (55610105605).

Almost surely, 2^111220211209 is an apocalyptic number.

It is an amenable number.

111220211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220211209 is an equidigital number, since it uses as much as digits as its factorization.

111220211209 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 111220211209 in words is "one hundred eleven billion, two hundred twenty million, two hundred eleven thousand, two hundred nine".