1311122221203 has 4 divisors (see below), whose sum is σ = 1748162961608. Its totient is φ = 874081480800.

The previous prime is 1311122221193. The next prime is 1311122221217. The reversal of 1311122221203 is 3021222211131.

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

It is not a de Polignac number, because 1311122221203 - 2³⁴ = 1293942352019 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 1311122221203.

It is not an unprimeable number, because it can be changed into a prime (1311122221223) by changing a digit.

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, 218520370198 + ... + 218520370203.

It is an arithmetic number, because the mean of its divisors is an integer number (437040740402).

Almost surely, 2^{1311122221203} is an apocalyptic number.

1311122221203 is a deficient number, since it is larger than the sum of its proper divisors (437040740405).

1311122221203 is an equidigital number, since it uses as much as digits as its factorization.

1311122221203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437040740404.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1311122221203 its reverse (3021222211131), we get a palindrome (4332344432334).

The spelling of 1311122221203 in words is "one trillion, three hundred eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred three".