1211122200985 has 4 divisors (see below), whose sum is σ = 1453346641188. Its totient is φ = 968897760784.

The previous prime is 1211122200863. The next prime is 1211122201019. The reversal of 1211122200985 is 5890022211121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 226693111129 + 984429089856 = 476123^2 + 992184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211122200985 - 2¹⁹ = 1211121676697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211122200985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121112220094 + ... + 121112220103.

It is an arithmetic number, because the mean of its divisors is an integer number (363336660297).

Almost surely, 2^{1211122200985} is an apocalyptic number.

It is an amenable number.

1211122200985 is a deficient number, since it is larger than the sum of its proper divisors (242224440203).

1211122200985 is an equidigital number, since it uses as much as digits as its factorization.

1211122200985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242224440202.

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 1211122200985 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred thousand, nine hundred eighty-five".