1311203311203 has 16 divisors (see below), whose sum is σ = 1749010553600. Its totient is φ = 873765903456.

The previous prime is 1311203311157. The next prime is 1311203311219. The reversal of 1311203311203 is 3021133021131.

It is a happy number.

It is not a de Polignac number, because 1311203311203 - 2⁶ = 1311203311139 is a prime.

It is a super-2 number, since 2×1311203311203² (a number of 25 digits) contains 22 as substring.

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 1311203311203.

It is not an unprimeable number, because it can be changed into a prime (1311203311273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100092948 + ... + 100106046.

It is an arithmetic number, because the mean of its divisors is an integer number (109313159600).

Almost surely, 2^{1311203311203} is an apocalyptic number.

1311203311203 is a deficient number, since it is larger than the sum of its proper divisors (437807242397).

1311203311203 is a wasteful number, since it uses less digits than its factorization.

1311203311203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24666.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1311203311203 its reverse (3021133021131), we get a palindrome (4332336332334).

The spelling of 1311203311203 in words is "one trillion, three hundred eleven billion, two hundred three million, three hundred eleven thousand, two hundred three".