1311220220122 has 4 divisors (see below), whose sum is σ = 1966830330186. Its totient is φ = 655610110060.

The previous prime is 1311220220087. The next prime is 1311220220129. The reversal of 1311220220122 is 2210220221131.

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

It can be written as a sum of positive squares in only one way, i.e., 1145497137841 + 165723082281 = 1070279^2 + 407091^2 .

It is a super-2 number, since 2×1311220220122² (a number of 25 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 1311220220122.

It is not an unprimeable number, because it can be changed into a prime (1311220220129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327805055029 + ... + 327805055032.

Almost surely, 2^{1311220220122} is an apocalyptic number.

1311220220122 is a deficient number, since it is larger than the sum of its proper divisors (655610110064).

1311220220122 is an equidigital number, since it uses as much as digits as its factorization.

1311220220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655610110063.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1311220220122 its reverse (2210220221131), we get a palindrome (3521440441253).

The spelling of 1311220220122 in words is "one trillion, three hundred eleven billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-two".